Roblox studio with Blender meshes (.obj) BUG

Hi guys! I was making a model in Blender, and when I imported the mesh (.obj) to Roblox studio.
And then i got some bugs. How can I fix this? Please help someone. I recalcuted the inside-outside normals of the mesh, in Blender but nothing… :confused:

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This question has been asked many times before, but, this thread will help you on your issue:

Even from recalculating normals, it might recalculate it backwards(if there are more backward facing faces in blender, blender would recalculate all the faces thinking that you have to have all of the faces backwards).