Please follow our submission template and guidelines and make a complete, valid bug report, with required info, precise description of the issue, precise steps to reproduce it, small and simple .blend and/or other files to do so if needed, etc.
Videos and/or links to external sites etc. are not acceptable as bug report (they can be provided as additional information only).

Please seek user support on user forums like blenderartists.org or blender.stackexchange.com.

And finally, please use import options of the add-on as needed (in that case you want to enable Automatic Bone Orientation, and most likely also Force COnnect Children).