3.0.9 CSS bug @media (max-width: 979px) and (min-width: 768px)

Since updating to 3.0.9 I noticed a small CSS bug at the width mentioned in title. A horizontal scroll bar appears. Also, I’m having trouble displaying both sidebars at some widths. The right one gets pushed below the content. Website here.

Does anyone else experience same problems? Any fix for it?

Has to do with:

@media (max-width: 979px) and (min-width: 768px)
.row-fluid [class*="span"] { margin-left: 2.762430939%;}

When I disable that rule (on all levels) the bug is gone.