Permalinks on all posts are now updated with "/domainname" creating 404 errors

Hey,

I do not know when this started, but a recent crawl for site-health has shown my blog has a 404 error for every single blog post I have created (100+)

This is just one example, but this same issue is applyign to every single post:

There is an error on the page http://www.sandpiperbeacon.com/blog/halloween-in-panama-city-beach/ – An seomoz Crawl is telling me that on this page, there is a link to the URL: http://www.sandpiperbeacon.com/blog/halloween-in-panama-city-beach/sandpiperbeacon

(notice the “/sandpiperbeacon” addition to the end of the correct URL.)

Nowhere on that page, is the link to “http://www.sandpiperbeacon.com/blog/halloween-in-panama-city-beach/sandpiperbeacon” – So I can’t see the link to remove it, and the fact this is happening to ALL blog posts, makes me wonder if it’s something happening within wordpress.

Thanks so much in advance for any help!