Have you managed to resolve this as yet? I am wondering whether you have accidentally added password protection to your website. To check this, when you are in the Website Maker Editor, look at the icons next to your page names. You have three, with the middle one being a lock. If this lock is dull, then there is no password protection on, and this is unlikely to be the issue. If it is a little brighter, you may have pressed this without noticing too much and that locks your webpages to unauthorised users (including you if you don't have a password) when it is live and online. You can remove password protection in the Editor without needing any password.

Hope you've got it resolved, or that this helps!