
I'm sorry. I'm not a sock knitter, so I don't feel confident that I can help enough, but, looking at the pattern, I'd say those slipped 11 stitches had already been knit--you're just rearranging the stitches. You're taking the 11 stitches from the right-hand needle.
If this isn't the case, maybe you can post your question in the How-To where our experienced sock people can shed more light.