hair (mesh??) not showing corrctly in studio!

You need 3 meshes for hair: 2 of them appear bald because they are used when the sim is wearing a hat, and 1 will be without hat. You mesh only have 2. You need to make sure all 3 meshes have correct cut numbers which make sure s4studio recognizes your meshes when you import file. I suggest you clone an EA hair and copy the cut numbers to your meshes.