It looks like the Switzerland and Nepal flags were "centered" in the sheet instead of having their class widths adjusted. Since both flags are an odd number of pixels wide, they can't be centered in a 16px-wide space, and so they are both off-center by 1 pixel.

There's no way to properly center them without adjusting the width of those two flags' divs. If that's not gonna happen, okay -- just making sure.

I'll shut up about flags now.