Exp Bug

Hello, 

Ive recently been hit by an exp bug thats making me without any boosts only get between 2-4.5k exp per game regardless of performance, i used to get between 20-30k per game, my friends in the exact same game performing worse than me get between 20-30k without any boosts. this is every game regardless of mode on official servers, can anyone please explain why this has happened and how i can fix this?

Thanks