Metahuman Control Rig IK/FK problem

Hi everyone!
I am having a strange issue with animating Metahumans. I’ve got mocap data, I baked them onto the control rig and FK controls are working just fine. It is an animation, where the character does jumping jacks, so the hand bone moves in nice cyclic fashion:

But the IK control of the same hand does this strange thing, where it keeps adding the cycles and the rotation angles go through the roof ending up in numbers like 1000 degrees.
Which is very hard ti edit further, because aditional animation layers cause the wrist to flip axis during the motion.

I should add that everything is done in the sequencer.
Can anyone help please?