Hi @catgirlpa and welcome to the forum.
Removing it from the app and start over from scratch is a good start. Another is to pull the battery out, then put it back in.
Yes, there are several threads on/like this problem in the forum. You can find them w/the manifing glass top right of this page, type in “Motion Sensor”.
If you click on the following thread there are several more. Hope this helps!