Skinned rig messed up when importing from blender to roblox studio

I have a problem with skinned rigging models. When I import a skinned rig to roblox studio, the mesh of the model messes up when I move the rig. But when the model is in blender the rig works perfectly.

In Roblox Studio:

In Blender:

If anyone knows the solution, please reply.
Thanks

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