Animation breaks only in the preview window


I imported an animation from Mixamo and used the auto retargeter to apply it to the GASP skeleton. Everything looks perfectly fine in the animation and animation montage windows, but when I execute the animation in the preview screen the arm goes out of place. I tried turning the IK for the hands off in the IK rig and the retargeter, but nothing has worked so far. I have gotten one animation to work, but all the others end up like this.

Any help or advise would be appreciated.