Super Smash Bros. Ultimate Ripping Project

[Sime0647]

When an animation is played the bones of the Ness' hands (only the hand bones) get weird: 

Someone knows what's happening and how to fix it?   I'm using Blender 2.83.20 LTS to ensure is not Blender fault. I did nothing but import the model and animation, also tried to align the bones to different axis but didn't work.