IPB added a feature in 2.1 where if you post, and make another post(s) within 10 minutes (I think that's the default, but this number can be modified) - it'll put it all in one post to prevent double, triple posting and spamming.
That is a problem here for a couple reasons. First, if a log is long and doesn't fit in one reply, if the poster tries to create a second reply the software will unsuccessfully attempt to add it to the first. The second reason is illustrated in the post by CalamityJane above my comment here: http://www.lavasoftsupport.com/index.php?s...=findpost&p=405
The feature can be adjusted or turned off in the ACP.