Lost 2 guns slot while in UVHM why?

I played all the way to UVHM got all 4 weapons slot, today while playing 2 of them was locked, and eventually disapeared now I can ony have 2 waepons equipe… Help!!!

If the weapon slots don’t re-appear when restarting the game in single player, try contacting Gearbox Software Support using the following link: https://gearboxsoftware.zendesk.com/anonymous_requests/new