While Im the party leader in 2v2 after losing the game Im losing experience points on the faction I was playing as.
For disengaging I lost 50 exp, for surrendering I lost 100 exp and for getting my ships destroyed I lost 150 exp.
After losing experience from these loses I deleveled.
(https://steamcommunity.com/id/Error3000/screenshot/951851593300179783)