A folder repeated in the address
WarningMedium priority
Addresses of this site where the same folder name appears twice, such as /shop/socks/shop/.
Why it matters
It usually means a relative link resolved against the wrong base, which quietly doubles the site: the same page answers at two addresses and both get crawled and indexed.
How to fix it
Find the page linking this way — its Links In tab — and write the link from the site root rather than relative to the page.
Skitter runs this check on every crawl, and lists each page it finds with the evidence: the header, the tag or the link that gave it away.