Why did my event count drop in Mixpanel?
The Mixpanel help pages give 4 common reasons. The first to rule out: Projects kept in a particular region need the matching host, and events that reach the wrong host are not taken in.
What causes it?
Projects kept in a particular region need the matching host, and events that reach the wrong host are not taken in.
In the Mixpanel help:
Events sent to the wrong host will not be ingested in your Mixpanel project.
Debugging, read 2026-11-12.Tracking from a browser can lose events, because ad blockers and Do Not Track settings can stop them.
In the Mixpanel help:
Client-side integrations are more vulnerable to data tracking issues due to ad blockers and DNT settings
Debugging, read 2026-11-12.Apps queue events and pass them on in batches, so recent events can arrive later than they happened.
In the Mixpanel help:
Events and User data sent to Mixpanel gets queued and flushed at certain intervals by default
Debugging, read 2026-11-12.Events that have not fired recently drop out of report menus, which can look like missing data.
In the Mixpanel help:
Mixpanel’s report dropdown menus hide events that have not been fired within the last 30 days
Debugging, read 2026-11-12.
How do I check it myself?
Check that the project token your site or app uses matches the token of the project you are looking at.
In the Mixpanel help:
If the request is successful, check that the "token" in the data payload matches the token in your Project Settings.
Debugging, read 2026-11-12.Check whether the event has been hidden in the project's data dictionary.
In the Mixpanel help:
Check Lexicon to review if the event or property may be hidden.
Debugging, read 2026-11-12.Check when the missing days' events were taken in, to see whether they arrived late rather than never.
In the Mixpanel help:
You can check the $import property and the mp_processing_time_ms to confirm when data has been ingested.
Debugging, read 2026-11-12.
How does Mixpanel work with Feder?
- Connect Mixpanel to Feder and it joins your Visits apps.
- When you connect Mixpanel, Feder checks the connection straight away and shows Connected only when that check passes. If a reading cannot be taken later, Feder shows it as not read, never as zero.
Some numbers are too quiet to judge daily, such as a form filled in a few times a week. Until there is enough of your own history to judge a change, Feder says it is still learning and scores nothing, rather than guessing.
See whether you can trust the numbers in Mixpanel, one of your Visits apps. Feder only reads. It never changes anything in Mixpanel.
What else goes wrong with these numbers?
- Why did my event count jump in Mixpanel?Mixpanel
- Why did my unique users jump in Mixpanel?Mixpanel
- Why did Google Analytics stop collecting data?Google Analytics
- Why aren't my key events showing in Google Analytics?Google Analytics
- Why does Google Analytics show (not set)?Google Analytics
See every question.
Where do these answers come from?
Every cause and check on this page comes from the Mixpanel help pages, quoted above with the date we read them. Last reviewed 2026-11-12. We read them again by 2027-11-12. If one changes, this page changes or comes down.