Problems with PHP/CSS in IE but not Chrome

I recently split my HTML site in PHP so I can make global changes more开发者_StackOverflow中文版 easily and get ready for a possible migration to Wordpress. The HTML version works with IE and Chrome. Now that I split the site in PHP it only works in Chrome. In IE a lot of the CSS elemets are missing. Is this a common mistake I can fix? Remember the same HTML code works in IE so it has to be something I am doing wrong in the PHP version. I have the same issue with another website I am working on. Maybe there is a special character I am missing?

Website URL: http://dursoboxing.com/

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Try getting rid of that comment right at the start. I think IE is a little shirty about having anything, even whitespace before the doctype declaration, and not having a doctype does much worse things to IE than it does to any other browser.

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Maybe some unclosed HTML tags in partial views? Modern browsers are quite smart and try to predict which tags to close first and later on.