I ask because, i noticed how after a game has ended, it still shows the XP/RP boost is in effect but it’s not in inventory anymore.
No, only one game/match.
The visual glitches up sometimes. But no, the boosts only last for one match per consumable. If you have multiples of the exact same boost though, it’ll be preset to the next one in the stack automatically (which you can switch for a different boost just like you would normally).
Thanks all.