If you start a new thread and then reply to it before anybody else does, your new post content gets added to the existing post to prevent double-posts from the same member. This also happens to existing threads where you reply twice when nobody has replied after you had first posted.
This prevents double-posts and thread bumping (knocking a thread up the forum category page to get more views).
This prevents double-posts and thread bumping (knocking a thread up the forum category page to get more views).
