Mixamo Action/Animation messes up my rig

So I want to apply an action to an already existing Mixamo rig (All bone names are correct). But every time I do so it messes up the orientation of some bones.
Sadly I can not use Micamos auto rigging tool because my rig is attached to an existing Model with correct weigtpaint. I have no idea whats happening.

Here is a link to the file: