Postbit: Some Users Have IP Icon, Some Don't

[L-Mane]

I am the admin, so is there something that I do not have enabled in the admincp?

[Jake Bunce]

IPs in posts? Is this option enabled?

Admin CP -> vBulletin Options -> Message Posting and Editing Options -> Log IP Addresses

This setting is not retroactive... posts made before logging was enabled will not have IPs.