Hi,
the problem appeared while playing the animation in maya and later while playing the exported animation in the unreal engine. The model does move correctly in maya, but the bones are moving out of the mesh.

That’s not causing problems in maya, because the bone movement does not influence vertices in maya. But the exported animation follows the bones in the unreal engine, so I’ll get a diffrent animation. I don’t know how to fix that Problem, because I don’t know what’s causing all the trouble. Does anybody know why the bones move out of the mesh while animating?

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I think that you are using FBIK or HumanIK rigg. Probably you need to reach T nad reach R handle from FK to IK on legs.

I am not sure but for me this has been visual bug. All you have to do is select the circle/ik handle nod of the problematic bone and slightly move it. Bone will be back in its place.