In this page when the width is between 1200 and 990 pixels it puts all <div class="span3">s in 1 column! It shldn;t really because it can still fit them all in 1 row (between 1200px and 980px).
And from 980px to 767px is also good. Anything smaller than 767px goes in 1 column as well.
What am I doing wrong here?