Dark-Hive and Dot-Luv Themes have overlapping buttons in a buttonset

When using a buttonset in the dark hive and dot luv themes, buttons overlap such that the right border of a selected button appears underneath the button to its right.

str:

Use the dark hive or dot luv css themes

Call buttonset() on a div containing 2 or more radio buttons

Click the left most button.

Observe that the border is not visible on the right side.

example:

http://jsfiddle.net/jakecigar/2wCFx/

note that you can remove the style from the div in that jsfiddle and this bug is still present.

seen in:

IE10 win8 app (honestly not sure how to get version # out of the win8 app)

Chrome Version 27.0.1453.110 m