You have translation keys set on the Foot bone, and it's treated as an Offset from the platform by CAT. if you delete the translate key, the foot will match the platform again @ 55 and after. Probably good to go through the bones periodically and clear out stray key frames until polish time
Hey Chaucher, I think this is basically just a normal cat rig with the limbs positioned differently, I tried pressing up but it just zoomed in, I should clarify that this is in 3ds Max, I tried zeroing out the foot platform and the actual foot but it just breaks it even more, I also tried switching to auto tangents but…