Using the latest courier 

My dev has the following script, which is different to the live site which does not have the var ifpa = @Request.QueryString["IFPAID"];  line, yet when I try to courier it it says there are no differences and refuses to courier it.

@{
  var ifpa = @Request.QueryString["IFPAID"]; 
  <SCRIPT language="javascript" src="http://www.ajtrack.com/pixel.track?CID=115126&MerchantReferenceID=@ifpa"></SCRIPT>
<NOSCRIPT><IMG src="http://www.ajtrack.com/pixel.track?CID=115126&p=img&MerchantReferenceID=@ifpa" width="1" height="1" border="0"></NOSCRIPT>
  }