weird distortion issue when ripping from certain games

[gyroscoperidertoppy]

there's this weird issue in certain games that i've tried to rip (especially using raw image loaders like TiledGGD or TextureFinder) where the top/bottom edges of the sprites are distorted as all hell

here's an image showing this issue (this is not unique to TiledGGD):

(this sprite in question is from a game called Alonix, though this issue is also present in some other games (especially older ones like Boovie or Watman))