You should fix your doctype and you have a whole bunch of conditional browser code such as
<!DOCTYPE html>
<!--[if IE 6]>
<html id="ie6" dir="ltr" lang="en-US">
<![endif]-->
Not sure why that’s there, but you could try taking it all out. Make a backup first in case you have to put it back.
Note that it is all for IE, and there is no “else” to create a default for cases where none of the “if” conditions are met. I’m not convinced that it’s even valid code. The whole problem might be that you havent declared a doctype. Should be something like:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="https://www.w3.org/1999/xhtml" dir="ltr" lang="en-US">
<head>