All I can tell from here is that the / doesn't appear in the html code for home.php or in the catalog. Sorry, but I don't know why it isn't there, but if it was me, this is what I would try and solve first.
If you want to email me a favicon, to save me making one, I will try and replicate the problem here and see if I can can get it working using this code.
Paul Dodman
e-business consultant
Lumino Internet
luminointernet.co.uk