If I remember correctly, DCForum is a flatfile forum (without threaded posts), so it's probably best you look at the UBB import for a comparison.
Actually, I looked again, and it seems it does have threading. So you'll have to make sure the post_root_id, post_father_id, as well as post_depth are correct. To update post depth after importing all the posts, you can do what's done in WWWThreads.pm line ~1021.
That sounds like you might not have set post_depth correctly for each of the posts. Make sure it's being set on each post before you do the insert. See line ~732 in UBB.pm.
Adrian
Actually, I looked again, and it seems it does have threading. So you'll have to make sure the post_root_id, post_father_id, as well as post_depth are correct. To update post depth after importing all the posts, you can do what's done in WWWThreads.pm line ~1021.
That sounds like you might not have set post_depth correctly for each of the posts. Make sure it's being set on each post before you do the insert. See line ~732 in UBB.pm.
Adrian