Thunderbird Problem

[Jimbob <Me@nofkinspam-mofo's.com>]

Hi

I have just recently installed Thunderbird so i'm not used the layout 
just yet.

The problem is that some of my n/g's show the exact same number of new 
posts, but when i enter the n/g there isn't any new posts. Everytime I 
'Get messages for account' it always says the same number everytime. It 
doesn't do it on all my n/g's just a few. Anyone know what could be the 
problem?

Thanks