Me too! Same issue after render the video 360. Only iphone 8 has this problem.
Gopro app v.6.2.1 rev.3398
Gopro Max v.1.30
but other devices that I test render is good. (No problem)
iphone 11 pro (ios13.2)
iphone 7 (ios13.1.xx)
Please help to fix it, please....
Sorry about that, this issue has been fixed in 6.2.2 - the version has been submitted to Apple so it's a matter of time before it's live.
If you want access to a beta and test further beta versions with our testers' community send me a DM / for that you should not be afraid of bugs and happy to share feedback ;)