insane win rate from sb/bb

hi everyone
my win rate over 50k hands from the sb is -8bb/100 and bb is -17bb/100

however Im a little worried because my win rate from other posistions are all over the place
meaning that my win rate doesn't gradually get bigger the better the posistion
but my RFI CC 3B SQU and so on do

EP 1.54
MP 20.2
C.O 40.7
BUT 16.9

is this too little of a sample to go off of ?
my win rate overall is 8.67bb/100 (AI ADJ BB /100) and all posistions in bb terms are crushing except for ep