If you log into your Google Analytics (GA4) dashboard and see a 100% increase across your numbers, do not assume it is real growth.
In most cases, what we see with our clients comes down to one of three things:
The GA4 account is brand new,
It is a new location property that was recently set up, or
GA4 is comparing your current data against a period where no data was recorded yet.
In all three situations, the math shows 100% growth simply because there is nothing to compare against.
That said, there are other situations that can create a spike in the numbers, including spam traffic, duplicate tracking, or a misconfigured conversion setup. This guide covers all of them.
TL;DR
A new GA4 account or location property has no historical data, so everything shows 100%
If the comparison date range falls before tracking was active, GA4 compares against zero
Spam or bot traffic can inflate sessions and users without any real leads behind it
GA4 installed in more than one place on your website will count visits twice
Misconfigured conversions can make it look like leads doubled when they did not
Always cross-check GA4 numbers against your actual calls, forms, and booked jobs
Common Reasons You Are Seeing a 100% Increase
1. Your GA4 Account Is Brand New
If your Google Analytics account was recently set up, there is no historical data to compare against. GA4 might be showing this week versus last week, but last week the account did not exist.
What you will see: Most metrics show 100% across the board.
What to do: Check when your GA4 property was created. If it is newer than your comparison period, the increase is expected and will normalize as data builds up.
2. You Are a Franchise or Multi-Location Business With a New Location Property
If your franchise or brand manages analytics per location, your specific location may have recently been given its own GA4 property. A new property starts with no history.
What you will see: A sudden 100% increase right after the location property went live.
What to do: Confirm the GA4 property start date for that location with your marketing team or agency.
3. The Comparison Date Range Has No Data
GA4 can compare two time periods side by side, such as this month vs. last month. If the comparison period has no data, GA4 treats it as zero and reports 100% growth.
This often happens when:
The account did not exist during the comparison period
Tracking was not working during that time (a tag was removed, the site was rebuilt, a plugin conflict occurred) and has since been fixed
Your retention settings make older data unavailable in the report you are viewing
What to do: Open the date picker and confirm the comparison date range actually contains data.
4. The Date Ranges Being Compared Are Not Equal
If the current date range covers more days than the comparison range, percentage jumps can appear that are not meaningful.
What to do:
Confirm both ranges cover the same number of days
Turn on Match day of week when comparing short timeframes to avoid weekday vs. weekend distortions
5. A Filter or Audience Is Applied That Did Not Exist in the Past
If a filter (for example, "Paid Traffic") or an audience segment is applied and it was not set up historically, the comparison period will show zero data.
What to do: Look for filter labels or comparison bubbles at the top of your report and remove them to check the unfiltered view.
6. Your Traffic Actually Doubled
If your traffic numbers are low, a 100% increase can be completely real. Five users last week and ten this week is a genuine 100% increase.
What to do: Check the actual counts, not just the percentage. If the raw numbers are small, large percentage swings are normal and not necessarily a cause for concern.
Tracking and Data Issues That Can Create Misleading Spikes
7. Referral Spam, Bot Traffic, or Purchased Traffic
Not every spike comes from real customers. Low-quality traffic such as referral spam, bots, or cheap purchased traffic can inflate your session and user counts without any real business activity behind it.
What you will see:
A jump in users or sessions with little to no increase in calls, form submissions, or booked jobs
Unfamiliar referral sources or traffic from locations you do not serve
Very low engagement, short session durations, or spikes at unusual hours
What to do:
In GA4, go to Traffic Acquisition and look for suspicious source or medium entries
Check the Geo report to see if traffic is suddenly coming from areas outside your service area
Compare the spike to your actual leads. If calls and forms did not move, the traffic is likely low quality
If you run paid ads, review your campaign placements and remove any suspicious traffic sources
8. GA4 Is Installed More Than Once (Double Counting)
One of the more common causes of a sudden jump is having GA4 tracking code installed in more than one place on your website. When this happens, every visit gets counted twice, which inflates page views, sessions, and events.
This can happen when GA4 is added through multiple sources at the same time, such as:
A website plugin and Google Tag Manager (GTM)
Two separate GTM containers
A hard-coded GA4 tag and a plugin-installed tag running at the same time
A new GA4 tag added without removing the existing one
What you will see:
A jump that starts on one specific day (the day a second tag was added)
Page views and events increase more than users
Conversions appear to rise even though your actual lead volume did not
What to do:
Ask your marketing team or agency to confirm GA4 is only installed once on your site
If you use GTM, make sure only one GA4 configuration tag is firing per page
Compare your actual lead volume (calls and form submissions) to GA4 conversions. If only GA4 jumped, duplicate tracking is likely the cause
9. Conversion Tracking Is Set Up Incorrectly
Even when traffic looks normal, conversions can show a large increase if the tracking setup has an error.
Common examples include:
A form confirmation event firing multiple times for a single submission
A click event triggering on page load instead of on an actual click
The wrong event being marked as a conversion (such as a page view or a scroll event)
A call tracking integration sending duplicate events to GA4
What you will see:
Conversions jump significantly, but actual calls and form submissions do not
A single user appears to trigger multiple conversions in a short period
Conversion counts grow faster than users or sessions
What to do:
In GA4, go to Admin and review which events are marked as conversions
Confirm that each conversion event only fires once per real user action
Cross-reference with your actual data: call logs, form submissions, and booked appointments
Quick Reference: What Does Your 100% Mean?
What You Are Seeing | Most Likely Cause | What To Do |
|---|---|---|
Most metrics show exactly 100% | New property or empty comparison period | Check property start date and comparison range |
Users and sessions jumped but leads did not | Spam or low-quality traffic | Review source, medium, geo, and lead data |
Page views and events jumped more than users | GA4 installed more than once | Check for duplicate tags across plugins and GTM |
Conversions jumped but calls and forms did not | Conversion tracking misconfiguration | Audit conversion events and how they are triggered |
Small numbers doubled (2 to 4, 5 to 10) | Real change at low volume | Focus on raw numbers rather than the percentage |
How to Check Your Data in 3 Steps
Step 1: Confirm the comparison period has data. Open the date picker and verify the comparison range covers days when tracking was active.
Step 2: Look for a specific date when the spike started. If the increase begins on one particular day and stays elevated, it is usually a tracking change such as a duplicate tag, a new conversion setup, or a new property going live.
Step 3: Compare GA4 to your real lead volume. Check your call logs, form submissions, and booked jobs. If GA4 shows a big increase but your leads did not move, you are likely looking at spam traffic or a tracking issue.
Bonus: Verify That GA4 Is Actually Installed on Your Website
If you want to confirm that Google Analytics is running on your site (and not running twice), there are two easy ways to check without needing a developer.
The first option is to install the Google Tag Assistant Chrome extension. It is a free tool from Google that you add to your Chrome browser. Once installed, visit your website and click the extension icon. It will show you which Google tags are active on the page, including GA4. If you see the same GA4 tag listed more than once, that is a sign of duplicate tracking.
The second option is to right-click anywhere on your website and select View Page Source. Then use Ctrl+F (or Command+F on a Mac) to search for your GA4 Measurement ID, which starts with "G-". If it appears more than once in the code, GA4 may be installed in multiple places.
If you are not comfortable doing this yourself, your Digital Shift team can check it for you.
Still Not Sure?
If you have worked through these steps and the numbers still do not add up, reach out to your Digital Shift team. Send a screenshot of the report showing the increase, your date range and comparison settings, and the top source and medium entries for the spike period. We can take a look and tell you whether you are seeing real growth, junk traffic, or a tracking problem.