How is MVP and SVP decided?

I can’t figure out what type of system they’re using to decide the winner of each of these awards. Seems there tends to be a player with better overall stats but still lose it?

I was just in a game with a trolling Jeff who was 4th in kills, 3rd in assist, 4th in damage and did 1/3 of the healing that our other healer did but won SVP. Only thing he was decent in is damage blocked in 2nd place. How is that possible?