Responsiveness Issue on Mobile Devices

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Hello I have edited my CSS to be responsive but for some reason I can't seem to figure out why it is not working on all pages (on mobile devices). It does seem to work just fine when resizing the browser on my PC.http://www.msgh.org

It works on this page for mobile deviceshttp://www.msgh.org/our-staff/

But not on the homepage or this page for examplehttp://www.msgh.org/our-school/...

I have went over all the CSS many times but can't seem to find what would be causing this, I have also made sure that these meta tags are appearing on every page.

<meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="HandheldFriendly" content="true">

I'm stuck on this one, any help would be greatly appreciated.

Thanks