I've been having the same experience. Ranked 13 in IE, 11 in Firefox.
I've got a Firefox Extension that allows you to change the User Agent String used by Firefox. If you have it set to Firefox it returns 11 if you change it to IE6 (still in firefx) it returns 13. So I don't think it is a different datacentre issue unless they are directing you to different datacentres by User Agent.
Weird thing is if I change the User Agent to be the same as Googlebot uses (or Opera or Netscape 4.8) I shoot down to number 15!
Weird!
DJ
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