twodan, are youy viewing the forum in flat or threaded mode? In flat mode, the posts are layed out one after another -- in the order they were posted. In threaded mode, you see the hierarchical arrangement, and you have to click on each post to read it.

You can change your preferred display prefs by editing your profile, but to switch on the fly, just click the flat or threaded links to the right above the list of posts.