Checking the source, the error is because <div style='position:absolute; top:-1323px; left:-4565px'> text </div> shows up before the <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
I have no idea where the stuff in bold is coming from. I do not have this problem with my test site, ncdevil.com/pc, which mirrors thepiratescove.us almost exactly, as it is my test site.
I have checked the plugins, no dice. Can't be the themes, as get same errors when change the theme.