I've noticed in Safari (Mac) that the header's are not responding the way that they should. I'm specifically using this in conjunction w/ Bootstrap 3 and a responsive table. I've also noticed that on an iOS device, using mobile Safari or Google Chrome, has the same issue. Here's what I'm seeing using a demo of bootstrap 3 from your site:
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HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4