Problem with uploading meshes

Hi everyone. I have come here, once again, to get some answers to a problem.
Recently, I’ve decided upon myself that I’d start making models for my game again, so that is what I started doing two days ago. I never have much time for this, though, which is why I stopped in doing this in the first place. But as I said, two days ago I decided to get back into doing this.
Whenever I’m making models for Roblox, I literary make them in the Roblox interface. I discovered how you could use unions to make different shapes, and with the right plugin for cutting out parts of an object that you don’t like, it’s fairly easy. Lots of people do this. Basically, I don’t know how to use blender, and I only use Paint 3D specifically for deciding how something would look.
I started on a really important part of the characters head yesterday, but since using “Rotate” and “Transform” didn’t help rotate the object how I wanted, I decided on exporting the singular union and editing the position of it in Paint 3D.
Since I exported it from there, I had to upload it as a Obj. But that was fine by me, because I don’t mind not being able to re-edit the actual object. When I uploaded these into studio, (There were 5 copies of it, all in arranged order,) I noticed while resizing these things that there was one issue:
Two of the parts were oddly tranparent, unlike the other 4. These were on the left, so I took some time looking through the mesh properties and settings, but unfortunately it was not a problem with transparency, and I don’t want to have to remake these. I still have the original union in roblox, in case I have to edit it all over to save time.

Here is what I’m having to bear with:


And here are the configuration settings for one of them, (they’re all identical anyways.)
what the
(The reason I took out the mesh id is because I’m not sure if it’s private or not, forgot to uncheck the “Upload to Roblox” in pre-mesh upload interface.)

It’s only the two on the left. I don’t know if this was an uploading issue or what.
Please help. I’ve never encountered a problem like this, and so I have no idea how to fix it.

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