I've disabled it somehow.

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There isnt any options to disable post counts so if you want to check the post count click on their avatar or if he doesnt have a avatar click his name and press view public profile

i think it's because you're only a blue belt. after looking around the forums for the past few minutes, it looks like post count is only displayed for players brown belt and up.

You have to be brown belt or up to see your post count on forum.