It seems this bug happen if you turn off the game before the end of the round when auto-repair is on, i guess it could happen as well if you run out of money while auto-repair is on.
Just to point this out Harald there seem to be no way to get rid of the bug through repairing, i had no repairing icon there even after turning off auto repair, in fact i had it everywhere except on that duplicated studded-thick green tunic over mail, wouldn't repair over time or after rebooting the game and it kept showing 5body armor on the web inventory screen.
I don't know if it fixes because i sold the studded version out of anger and lost both, how smart is that of me?
Guessing the answer i won't ask again for it to return, RIP my dear thick green tunic over mail
Anyway guys i hope it helps,
cheers