when I looked at my inventory, I got 2 boar's magatama but I originally had one (IDK where the other one came from, so I assume I picked it up on a Dungeon and did't realize it) so I tried to equip it.. after I equipped both of them I can't access my equip or status panel anymore.. what should I do?

As of time of writing, CS has announced that this bug will be patched in the scheduled maintenance following shortly.

I had the same issue too, so i know what you mean.