The backup hand weapon is duplicating to the primary hand, so it looks like you have the exact same weapon equipped for the primary and backup weapons. I am running a two hand axe as a backup and a greatsword as a primary, but the axe will duplicate to the front hand, which shows an axe for both equipped weapons. This seems to occur after traveling at random times and I have noticed it more often when grouped, but it still does occur when playing solo. It will eventually fix itself after traveling or going through a door, but it is still an annoying bug.
Thank you
Xbox Series X
NA Mega-server