I don't see a way to correct this on the website and it tells me to re-publish with FTB. Erasing the site and republishing gives the same results? This can be seen at GH White Family website.
there are two reasons that can cause individuals to apear as 'unknown' in your site: if you marked them as 'Private' in the FTB or if you have a problem in the projects' language setting
please read this FAQ post which explains how to check and fix both scenarios:
Why do I see "unknown" individuals in my tree online after I publish from Family Tree Builder?
Shachar / Myheritage.com Team