Hello @Bal
this sounds bad but unfortunately I can’t help with this here, since it’s totally Database vodoo what could have happened here, which I can’t track.
Without a video showing this, nothing I can do unfortunately
Did you have at least one space free in your backpack? It seems the game always wants to put things in before taking things out. I’ve noticed this happens in many instances involving tokens (Alien Wave, HWP mission, Zombie Digger). As a result anything involving moving/handing over tokens I always make sure I have space first (temporarily dropping stuff if need be and picking up again once token handover is complete).