Creating IK animations and blending to Epic's default FK

After doing some more testing it doesn’t appear to really be an IK problem at all. I quickly started a new scene in Maya, added the mannequin in for animation. Turned all controls over to the FK Mode and still have the same issue shown within the video.

This raises the question of if Epic’s default animations being comparable with anything I create? Or am I missing a step to fix this issue? Something in Unreal that I missed?

EDIT: Looks like the ROOT bone in the default Epic animations has Y forward and Z down so I’m assuming this is the main issue but have no idea how to fix it. Any ideas?

Any help at all would be amazing! I really need something to fix this issue and I’d rather not have to go in and animate bones directly but I will if that’s required to have anything work with Epic’s default animations.