Question UI Elements position problem after Unity restart

Hello everyone,

I have a weird problem. Every time I restart Unity 2022.3 my UI doesn't work like before I closed the program. I made a Prefab for my UI game objects: one prefab for the dialogue system and one for static elements like the clock and other things that need to be shown permanently.
After Unity restart, these prefab Y positions get overwritten automatically to 0 and some of the child values are set to NaN.
Also, child prefabs caused rebuild loop errors too but I could fix that by resetting the prefabs...
Anyone here with similar issues or tipps to get this solved? Is the problem that my Canvas in inside a Game Object Prefab?

 

If your Prefab is set, but I ta tiated in scene, then you need save scene.
Chances are you manipulate values of game objecs instantiated from prefabs, but not saving the scene, when closing Unity.

That is my guess however, what may be cause of the issue.

 

Thank you for the answer but I don't think that it's because I am not saving my scene. I save like crazy and make sure there are no uncommitted changes.