My team is trying to submit our game to the jam but it appears that we can't. We can't tell if this is because we have already submitted it or if it is for some other reason.  The only background info I can give is that when I go to select "Existing project", the game doesn't appear. It already has a public itch page. HALP pls. 

i had the same problem, go to project settings and change visibilty to public

It's submitted

Yes, "Submit your project" button doesn't go away, because you can theoretically submit multiple projects

Only the person that made the game page can submit it apparently (not the admins)! We were able to submit when waffle woke up (uncomfortably close to the end of the submission period). I ended up creating a duplicate page for the game and deleted it after waffle submitted.