The prefab values keep changing

I have a prefab, referenced by a script in the scene, and instantiated runtime. I don't have multiple instances of the prefab or anything like that.

When I edit even a single value in the prefab, the source control shows many, many changes to the prefab. The changes are like:

value: 0 => value: 717.5

There aren't any visual changes at runtime, everything works as expected. The next time I make a little change to the prefab, the source control shows just the opposite changes:

value: 717.5 => value: 0

It's really hard to trace the actual changes, my prefab contains the most part of the UI. And it's really annoying. For example, I only edit a single color, and I receive 100-200 rows with changes. And in the next commit, I receive 100-200 rows with just the opposite changes.

Thank you for your help.

[1]: /storage/temp/196772-unity-prefab-changes.png