That's the [duplicate characters bug. [URL="http://positioniseverything.net"]PIE](http://www.positioniseverything.net/explorer/dup-characters.html) does state that it's an IE6 only bug and has been fixed in IE7 but that isn't true, unfortunately.
Have you tested it with removing some of the HTML comments?
Other than that, try overflow:hidden. Perhaps that works?
I currently don't have IE available to me, but try the above as well as experiment with display:inline.