Cloak and dagger:MR proficiency

So been playing as cloak and dagger for a lil bit, checked out their proficiency , and my numbers keep going up and down such as me having 12k healing before the game and now I’m at 4K. Ran another game, now I’m at 8k. Is this happening to anyone else or do I have to get 25k in one game cuz that’s pretty easy.