I have encountered the same problem, and i finally have a fix to it:
- you’d better delete all the control gizmos only leave the cat bones
- link all your props such as swords , guns to your CAT pelvis bone, so that the pelvis bone is the root in the hierachy
- skin the props above to the corresponding bone like the hand bone
- select all of your geo and all the cat bones (except the two foot IK platfroms and the CAT base object: the triangle thing)and export, it will work just fine, i have tested it, it finally worked.