Invisible equipment in inventory

[Ball]

Hmm.. Well, i didn't snap screen shot alot, but right after i snap this screen shot, i used the slot merging tab, and this happens. The medal in chinese words (I'am Potato), along with all the weapons including nx weapons are gone with the medal.
Then can I atleast get back the nx weapons that was shown inside the pic. I know its not much but still cause me a lot of time gathering equip ticket to change those.