Why did my user count drop in Amplitude?
The Amplitude help pages give 3 common reasons. The first to rule out: An event can be left out of a chart by a filter or because someone hid it from view, as Amplitude's docs explain, so a chart can drop while the events still arrive.
What causes it?
An event can be left out of a chart by a filter or because someone hid it from view, as Amplitude's docs explain, so a chart can drop while the events still arrive.
In the Amplitude help:
The cause is usually a filter (such as a drop filter) or someone hiding the event from view in Amplitude Data.
Missing or unexpected data, read 2026-11-12.Events from an app are held on the device until a set amount has built up, so the most recent counts can be low until they arrive.
In the Amplitude help:
The SDK doesn't send event data until it reaches the threshold.
Missing or unexpected data, read 2026-11-12.Data that reaches Amplitude in batches or from a server can arrive later, so recent days can look low before it lands.
In the Amplitude help:
Amplitude's Batch API and server-side integrations have inherent delays.
Missing or unexpected data, read 2026-11-12.
How do I check it myself?
Check which time zone your chart uses, since a day's count shifts when the day starts at a different hour.
In the Amplitude help:
Amplitude timestamps the data it ingests in UTC, but you can customize the time zone within the Amplitude UI.
Missing or unexpected data, read 2026-11-12.If you compare Amplitude with another tool, check that both leave out the same bots and scrapers.
In the Amplitude help:
Amplitude and the other platform block the same web bots and scrapers
Missing or unexpected data, read 2026-11-12.
How does Amplitude work with Feder?
- Connect Amplitude to Feder and it joins your Visits apps.
- When you connect Amplitude, 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 Amplitude, one of your Visits apps. Feder only reads. It never changes anything in Amplitude.
What else goes wrong with these numbers?
- Why did my session count drop in Amplitude?Amplitude
- Why did my user count jump in Amplitude?Amplitude
- 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 Amplitude 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.