Deleting and reinstalling the app will not remove any devices from your account. Those are stored on the server, not the app. They will all appear back in your device list once you log in.
Before you do that though, try clearing the cache in the app, signing out, force closing the app, reopening it, signing in, and testing it.
It might also be useful to isolate it to your phone \ app combo by installing the app on a different device to see if you get different results.