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Hello. I made this and it I think I am missing something. When I try to slide in the box it wont slide in with the magnet side at the top. It does not fit into the groove and is a few mm from sitting flush in the spine. When I flip it so the magnet portion is down it fits perfectly but now the magnets of the cover and box dont line up and the outer paper groove side is by the spine. What did I do wrong here?