https://gyazo.com/2f3517fbcd25b240a3def34355f2bb72
https://gyazo.com/b17bb5f9c1bfdfbc17d753b9e1a29b40
There is another group of vertices moving when its not assinged to the group which the bone is applied to. Works fine and supposed to in blender. Possible bug?
Pretty sure I cant see vertex groups in obj unless im able to export it in fbx pretty sure
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I think the problem is happening because I don’t see any bones for the Torso. Does the arms, legs, tail and head work?
Also for my perspective you should put a RootPart for animating the Torso too.
I am not a modeler, I may be wrong.
Importing bones cant be done with obj
looks like vertex groups also dont come with obj
I use avatar importer to get the 3D model + rig in roblox
Has to be FBX
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Weird thing is
The right upper leg is the only one with the problem
Ive imported it into a different file
Only top ones next to the tail are also included
But that shouldnt be a huge problem
Since on the gif the entire front body moves aswell
https://gyazo.com/2f3517fbcd25b240a3def34355f2bb72
I would expect atleast some verts at the front being selected aswell to make such a stretch
Thats why I tested earlier in pose mode to make sure it wasnt blender
Mmmm yeah im like pretty sure its a bug in the Mesh Deformation mechanic otherwise it would have appeared in blender aswell.
Well if anyone can confirm or knows what is going on let me know 
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I think there is a problem weight painting
you should watch a tutorial for weight painting on youtube and try and see if you can fix the model
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