PHP messing with HTML?

I am definatly no where near as good as most of you with PHP, but I have been coding HTML for about 6 years and I like to think I'm pretty good at it. In my most recent project I was using php pages (eg ?p=whatever), and I have used this type of navigation before, however on this recent project it seems to be screwing with my tables. The weird thing is, If I click refresh the tables fix themselves, But whenever the page loads it ALWAYS messes them up (screws with the alignment)

to see what I mean check out saintsstudios.com.

If anyone here can tell me how to fix this it would be greatly appreciated.