Strange Behaviour of Moderation in vBulletin 3.8.6

[Mr Happy]

Creat a new usergroup for scratch. eg call it Memberz. Don't copy any existing usergroup. Once you've it all set up see if they're posts are moderated.

The answer to this will help us identify the problem.

[XSLTel]

check whether Akismet Spam Management enabled or disabled in Forum Settings

[Palooo 2009]

Created the new usergroup and posted some threads and they got posted fine.

So what could be the problem?

[Palooo 2009]

check whether Akismet Spam Management enabled or disabled in Forum Settings

Akismet Spam Management, in vBulletin?

[WrzAddiction]

Created the new usergroup and posted some threads and they got posted fine.

So what could be the problem?

Compare the settings of your old usergroup and new one...and try changing the settings

Also disable Akismet Spam Management as the op said

[Palooo 2009]

There is no Akismet Spam Management installed (if any). Compared the settings too but not solved yet.