Exported "Actions" from Modo don't work in unity.

Hello,

In Modo I have a Golem "actor" under the animation tab. With the Golem actor selected I have a "walk" action. I export an .fbx animation with he "walk" action selected and when I display this .fbx in unity, the mesh is getting pulled in random directions.

For the mesh itself I have heat bound it to the joints, and the joints are being controlled in Modo with some controllers.

the left is Unity the right is Modo.

I'm not sure how to solve this problem so any suggestions would be great.

Thank you