Imported Custom Skin Glitching

This glitch just started recently right after I played on the new 1.17 update. On both my screen and my friend's (who plays on the console version) my custom imported skin has been glitching in various different ways. The skins in question are custom ones I've edited as a png on my computer and have never acted like this before. It seems to change all the time with no obvious signs for why it changes, but it goes from being randomized colored pixels to fully covering my skin's body in red and green. The pictures attached are just a few of the ones I've remembered to take pictures of. Sometimes in the game my skin will look normal to me, but to my friend I'll still have some glitched pixels covering my skin,