Firstly are you sure it "isn't counting". The stats module will exclude all hits made by admin users regardless of platform or browser. So if your logged in to your admin account logout then check again.
Secondly make sure the sniffer module is installed as this is required for the stats module. The stats module relies on the sniffer module to identify browser and platform info.
A quick way of checking the user agent is via the admin interface of the sniffer module (index.php?module=Sniffer&type=admin). This will give you the info that the stats module is using when counting hits for your own system.
-Mark
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