Since when does this happen?!?!?!

if ur in a game .. for example like today this hacker was killing everybody over and over and my kd was 30-45 and i left cuz i didnt want those deaths (which weren't my fault)after i left i noticed now even if u leave it still counts the deaths!!!! wow thats dumb! ... now im curious does it also give u the kills right?!?! and say you get Disconected or kicked or stuff like that does it still count kills/deaths???!?!!?! and what about the exp and gp?!?!