cant post at times

i just tried to post something in the useranywhere section and this is what i get

the last posting from your ip was less than 90 seconds ago try later,this was my first post today?

Yes to stop spammers there is a 90 second limit between PM’s and posts.

i just tried to post before this and got the 90 second thing but i have not posted in days,why does it do that?