how do I fix this?

When I logged onto my AMCAS app last time, a message box popped up telling me that if I'd made changes, I'd need to resubmit my app again. Well, that "Certification and Transmission" box was unchecked so I clicked it to make sure. I got this terrifying page that said that deadlines were up at a few schools I was applying to (even one I'd gotten 2ndaries from) and I'd have to delete those schools off my list before I could resubmit... Disheartened, I went to my list to delete them, but it wouldn't let me saying that I couldn't delete schools after I submitted my app... what's the deal? Is that little glitch going to cost me some schools, or is it something I don't need to worry about?

Any advice would be appreciated... Thanks!