I am currently checking my website to see how valid it is to xhtml 1.0 transitional using W3C markup validator. On one page I had 1 error, a missing closing </ul> tag. I thought cool thats easy to fix, I checked the code and it was missing so I put the closing tag in and revalidated, however much to my surprise for the same page I now have 8 different errors, crazy errors like attributes contruct errors, tag mismatch errors and extra content at end of document errors.
I use a CMS and some of the tag mismatch errors would be in the CMS theme code and i just dont see them and these errors dont replicate on other pages and they should as the theme is site wide.
I am confused at why fixing an error would bring up more errors which are not there, at least I cannot see them and the validator does not see them on other pages.
Is the validator broken, or is something else throwing these errors?