Yeah I've been noticing that when you upload literature here, the blurb has a maximum of 500 characters. However, when you first upload a piece, you can actually go over the 500-character limit. It's when you edit the submission that it informs you there's a limit, and whatever edits you did regarding the image, author's notes, etc. will have be redone as well. 

Annoying, but now I know for sure. -_- Just thought I'd mention it.