Auto rigged Character get stucked spine (Hips) bone (Blender)

Hi 

I got a wierd problem. Easiest way to explane is like below:

If I copy keyframes from a animation from Mixamo to a Character I downloaded from Mixamo, the Character will run the animation perfectly.

If I copy keyframes from a animation from Mixamo to a Character I Rigged in Mixamo, the Character will run the animation perfectly, but the Hips-bone will hold the character at the same position (when the animation runs).

The armature looks exactly the same. Any Idea anyone?

Thanks in Advance

Ken