The only way i was able to kind of work around that issue is to sample the motion clip of the hip bone and remove / edit the keys.
In UE5 i also tried to fix this using a recorded take, by editing the keys in the sequencer. However, this is of course a PITA.
Also, if there is a root offset in the animation, there seems no way to remove that in iClone before export 🤔
EDIT: i rather meant the 'BoneRoot' not the hip bone.