fbx object is semi-transparent

I made a simple lamp in blender for a simple game. It looks fine in blender but parts become semi-transparent in unreal.

What could be the cause and what can I do to fix it? I’ve tried to change materials and redo the UV-map. I would prefer to not have to make another one since 3D-modelling really isn’t my thing but if it can’t be avoided, so be it.

I’d greatly appreciate any help!
Also I’m sorry if the images are weird in the post, I’ve tried to upload the image from my computer but it gets stuck at 0%uploading for about an hour so I added them as links.