I'm having the same problem. I wasn't able to submit the game. The submission page just says there are no projects on my account that I can submit. Now when I go back to the game page itself, it says it is submitted. How? I was never able to even select it for submission so why now is it suddenly submitted? The submission page still says I have nothing I can submit (I would expect it to say thanks for your submission or something). Is there a way of verifying that my game has been submitted to the jam? I don't want to miss the deadline thinking it's submitted when it actually isn't.
I love Itch, but this is really confusing. I would prefer if my games were not submitted automatically. I want to manually select the game myself and submit it so I know that it's been done. If you are going to do it automatically, a notification to let me know would be nice. Also if the submission page would let me know that I have already submitted, it'd clear up a lot of the confusion.
But yeah... to the point- have I submitted to this jam?