Hi Judy, I have no exact idea why this would happen but there are a few things you can try:
1. There is an error occurring that needs to be fixed:
Uncaught exception: TypeError: 'jQuery(".menu").tinyNav' is not a function
Error thrown at line 18, column 0 in http://www.sdrarch.com/build/wp-content/themes/responsive/js/responsive-plugins.js?ver=1.1.1:
This is caused by the fact that the function tinyNav is commented out in http://www.sdrarch.com/build/wp-content/themes/responsive/js/responsive-scripts.js (so either comment out the related part in responsive-plugins.js or reactivate the function in responsive-scripts.js)
2. The doctype declaration is preceded by a blank line and a space. Fix this so that
<!doctype html> is the absolute first thing any browser gets to see. You might need to remove the space from your themes header.php or find the plugin that is causing this...
3. I see this semi-conditional statement below the doctype:
<!--[if gt IE 9]><!--> <html class="no-js" lang="en-US" prefix="og: http://ogp.me/ns# fb: http://ogp.me/ns/fb#"> <!--<![endif]-->
which you might want to change to
<!--[if gt IE 9]> <html class="no-js" lang="en-US" prefix="og: http://ogp.me/ns# fb: http://ogp.me/ns/fb#"> <![endif]-->
4. Finally there is this conditional statement:
<!--[if lt IE 10]>
which might be causing this. Try removing it and see what happens.
And is there a special reason why the charset and viewport meta tags are commented out?
Hope you can figure out what's going on with IE. Always a tough one...