I just noticed this recently. Your feeds are generating script errors on IE (IE 8). I have tested both javascript and PHP. It's okay on Firefox.
Webpage error details
Message: Expected ')'
Line: 1225
Char: 42
Code: 0
Message: Expected ')'
Line: 1241
Char: 42
Code: 0
Message: Expected ')'
Line: 1257
Char: 42
Code: 0