Codes being deleted

Making a blog for this too- my codes are literally being DEMOLISHED and I wanna know the reason, the codes are for friend masks (which I have made sure to make transparent) and the </iframe> code for background music, both of which just seem to get deleted, and it's getting annoying, is this a common and fixable issue or am I just screwed?

Edit: I FIXED IT turns out I js had to wait for some reason