Okay so I should've seen this when I first uploaded a custom sprite sheet.
I was working on a new sprite sheet for Chip's Challenge 2, (Although they call it, Tileset) and I decided to upload it as a BMP for easy download. I just looked at the download button and it said the file format is JPEG. That's a huge problem for spritesheets.
Deviantart supports JPEG, PNG, and GIF. And I think PSD.
How come BMPs converts to JPEG?