Rotation gets changed by animation

I’m trying to animate a character in Unity. The problem is that the rotation I set it to via key frames, gets changed as soon as I stop recording the animation.
(A rotation of -7 turns into -62,902)
Changing the interpolation to quaternion only helped to fix the problem with one arm. The other arm still had the same problem, even after changing the interpolation.

This didn’t exactly solve the root problem, but changing the rotation of the keyframe itself worked.
Still open for solutions though, because the normal way still ends up like this.