The background around "Open" isn't a full border radius'd rectangle. It just is open ended on the right side. It happens on the Core skin by Russ at PixelExit,
but it also happens on the default Xenforo skin (and every skin I've ever used) including the nfljunkies website as seen below,
I use Google Chrome & XF 1.3, if that's something you need also.

but it also happens on the default Xenforo skin (and every skin I've ever used) including the nfljunkies website as seen below,

I use Google Chrome & XF 1.3, if that's something you need also.