Posts in moderation queue

[MAdotcom]

For some reason some of the members on my site cannot post threads or replies to threads without those posts going in to the moderation queue. I've looked at the permissions for their usergroups and it says they can post without being moderated. What gives?

TIA

update

got an answer here

http://www.vbulletin.com/forum/showthread.php/372103-Some-posts-end-up-in-moderation-queue