Hmm, that’s strange then. The older ones, I wouldn’t be concerned about (although you may still want to upgrade to v1.22.1 just to eliminate possible culprits). I had the exact same problem in https://forum.syncthing.net/t/keep-getting-conflicts-generated-on-android-device-for-files-modified-only-on-a-desktop-pc/19060 but it was fixed after upgrading to v1.22.1.
There is still the other issue of conflicted copies in Android that has only been fixed very recently and isn’t yet available in Syncthing stable, but it doesn’t sound like that’s related to your problem.