Earlier today I received an email from the UE4 Marketplace Staff stating that my submission has passed the first stage, and I was linked in the email to this link(among many others with errors):
I also saw a post by another user today having similar issues:
Hi there! The seller pages have a bug we’re currently working on. When we migrated our seller database to the new Publishing Portal, a few sellers didn’t have their correct Epic ID associated with their seller account. I’ve been going through fixing the ones I can find today, and we’re working on a full solution for this. Sorry for the glitch, fixing as fast as we can. 
Have you noticed any more beyond those?
Also, that’s peculiar that the submission guidelines link is broken. The new location for that is here: Epic Games Technical Support & Customer Service | Epic Games But the old one should still work. Will look into. Thanks!