Weird blender transparency issue?

When i upload my meshes to roblox studio from blender and look at them they have this weird face/transparency issue where the mesh it still there but you can only see the bottom mesh Ex:

Its not suppose to be transparent like that, does anyone know how to fix this?

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Your mesh likely has backwards faces. Check this thread for a good solution. And please remember to use the search feature before making threads :slight_smile: