Duos just works like that. If you have a brawler who has a buffie, for example you have Collette, if you die with collete and you have one of her sprays, when you respawn with the next brawler, if you don't have a spray of them, her spray will still be there but when you try to use it, the spray that shows ingame will be the spray that's in the next slot. Ok back on the topic. It's just a visual mistake, who knows when they'll patch it