do they have valid hostmasks? try .channel #chan to verify they have a HANDLE listed... are you using +g? or +v? if you are using +v the room would have to be set +autovoice to work.. .help chanset && .help chaninfo
Neostats have a common host, like *@stats.yournet.org
Just add the user neostat with this mask: *!*@stats.younet.org (think to look up for the host on your network) and add this user a +v