Need help with a sprite bug

[KANSEI DORIFTO]

Im currently working on a character for SRB2 kart but there is something weird on its turning sprites, whenever I turn right there is a thin black line that apears on the top-left side of the sprite. I assumed it was me that accidentaly left it there but there was nothing at all when i checked. And its even weirder because it ONLY happens when turning left, and srb2 kart uses 1 turning sprite and simply mirrors it when turning the other direction. So im wondering if anyone knew any possible fix?

 

[KANSEI DORIFTO]

I tried diferent sprite editors now including one of the recomended editors from the wiki but still facing the same problem, im not allowed to post attachments yet so i cant show screenshots of the bug.