Do bots/testers open my app when uploading to TestFlight?

I'm receiving exceptions and user reports from devices that don't belong to my testers. One of them even has the Chinese language set in it. Another thing is they dont seem to have any iCloud account set up so it makes me think its an emulator of some type.

Is it possible these reports are coming from any TestFlight bot or tester ? Or should I start to worry of who's having access to my app?

Thanks