There seem to be a few problems which could cause TeamSpeak Server not to report statistics as it should:

1) TeamSpeak Server Service (not normal runtime) appears to have a bug, causing it not to report statistics. Currently the only "fix" is to download the normal TeamSpeak Server version.

2) TeamSpeak Server accidently mixed up the GET and POST methode for submitting information to HTTP, check the POST and GET variables.

3) TeamSpeak Server might not report statistics if you are running the Webserver on the SAME computer as TeamSpeak Server itself. Try to load your TeamSpeak Server on a different Server.