Maybe "scroll" is the wrong word - wrap? It happens with IE and Firefox.
I made a mistake about your site, Jade (http://www.zencart137.jadetrue.com/). This menu does not have this problem - seems to be a static length.
Here's a screen shot of my site with a reduced sized browser window. Since the menu text is white, when the menu wraps below, the background color is very light, making it hard to see the menu entry "Gifts":
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