add/edit page validation errors

Hi, I’ve been making a new plugin for a client, that uses custom meta fields. I noticed on a clean install of wordpress 2.8 if i try to validate the add/edit pages site I get a few errors I suspect from custom fields. Bellow is the errors I receive from the w3schools validator:
character “[” is not allowed in the value of attribute “for”
…class=’screen-reader-text’ for=’meta[33][value]’>Value</label>

On a fresh install I get about 2 errors but after a couple of edits to the page I can get about 60+ !!
Im stumpped anyone have any suggestions? site is running on localhost at the moment so cant give you a link to reference.