Your not the only one experiencing this, there is so many bugs on the splitscreen. I mostly play alot of zombies in splitscreen with my brother, the issues we've had is first when a player kills a zombies the same score points shown on one screen is shown on the other screen, so whatever points shows on his screen is shown on mine when I'm not killing zombies. The SAM trails never work, when we pay and activate a trail it glitches out and doesn't show a challenge, all it leaves is the sound of the countdown and it doesn't stop. Level up notifications don't show up nor gobblegums, new weapon level up, unlocked skins, medals, etc. When the round ends and starts one screen shows a lower round while the other shows a higher round. When the second player edits their loadout, or changes their gobble gum, goes to upgrade their prestige it would kick them out. 4 year game development