Device active but recent events list empty

I have a smartthings motion sensor under the eave at the front of the house and one at the back. Both trigger the respective lights between dusk and Dawn. On the app and on api website both report temperature, battery level (>70%) and last activity. However, when I go to the “recent” tab for the front motion (in th app) it is empty while the same tab for the back motion shows motion and temp history. Same on the website - front motion list is empty while back motion is what you would expect.

Finally, the hub is closest to the front motion sensor, so this isn’t a range / repeater issue.

Any thoughts? Not sure how long it has been like this but I do know that there recent activity list used to work fine.

I have the same issue with a ST Multi Sensor. I’m going to try and pop out the battery and put it back in to see if it “restarts” or something.