It probably wasn't tested with this old of a version of chrome/webkit. Works fine for me (I'm on Chrome 28.0) at that resolution. Assuming the browser version is the issue, I don't really see it as being a problem that bootstrap needs to address. Versions of chrome older than 22 account for 1.3% of the browser market share, and since bootstrap has dropped support for IE7 (0.7% MS) and FF3.6, it isn't surprising that they aren't targeting this.
[1] http://www.w3schools.com/browsers/browsers_chrome.asp