Why do my animations snap back?

I cant even set a new frame without it snapping back to the first one. Just yesterday I managed to animate a camera and now I cant even animate a piece of glass rotating.

yes strange,
can you disable the proportionel editing,
just a guess!

You probably have keyframes. After animating, register a new keyframe for any animated property, sometime before changing frame or saving/quitting or rendering.

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Yes, the problem is almost-certainly going to turn out to be keyframes. Or possibly drivers, but unlikely. There is something that is right now calculating the “next position” of this object when the frame-number changes. Look at the Curves Editor, Actions, and so on.