The shipping page won't load

I got the shop pretty much set up but when I test it and click through to "checkout now" I get a reply that says "The page isn't redirecting properly - Firefox has detected that the server is redirecting the request for this address in a way that will never complete." and the site in the navigation bar is this:

Not sure what all the extra "~quiltcon"s are all about?

I'm not very knowledgeable with these things so I'm crossing my fingers that it's an easy fix. Also, the shop is currently private as I'm adding it to a public site and need to have it all set up before making it public.

Thanks for your help!