For the best chances of getting a bug fixed, it should be reproducible. If it seems random, It might be helpful to make a new project and do basic tests to narrow down the cause.
Also, if you can provide some screenshots, that would be helpful.
I’ve seen some strangeness with prefabs myself, specifically with them moving slightly after pushing changes. (Moving themselves to the ‘Fortnite’ grid? Something involving the parent/child relationship? (the prefab comes in with a parent root))