Missing device history?

Anyone know why the history for devices is sometimes there and sometimes not? And it’s not that the device has no history.

Some days the history tab underneath the device says “no history”, and then within a short period of time or opening/closing of the app the entire history will populate.

This is iOS app. Has been happening for quite a while.

It’s not just you, I have seen this. On IOS and android.
Also the history filtering from the main menu often does not work properly and shows no events.