Head over to the W3C Markup Validation site and test the HTML code.
IE has always been different in the way it handles HTML Markup code, and although IE8 and IE9 are getting closer to standard, there are still differences. That might be why you see the changes from one browser to another.
I did a quick test of your site myself and saw 58 errors and 7 warnings. You can check for yourself how critical or not, as the case may be, those errors are.
I have a website running, at first it seems it is working right. but when I test it to browsers I saw a difference, my web Navigation bar is stretching from left to right with Chrome & Mozilla, not like in IE 8 that it just stays at the middle
my problem right now is I think it does look like better in IE 8 than the two other browsers.
can anyone help me about this. my website is running by CMS wordpress