Retargeting mocap to UMA rig via .fbx animation file

Hello

Does anyone have experience retargeting animations to a UMA rig, same as mixamo does?

In maya the animation looks perfect, but when importing the UMA_Male@animated-bones.fbx one feet goes crazy without explanation.

video attached
https://www.dropbox.com/s/zxwythvsq3b9oao/LvRPrHTmW1.mp4?dl=0

any help will be appreciated
thanks