In this case (I've seen it before), when you went to page 2, you refreshed your pointer (date/time as RCook says), thus, the "27th" message was visable to you. I have also had this happen in C&D where there are some very long threads. I go in to read one and by time I come back to the new messages, more have shown up. Since they do not track the actual messages (would be a huge burden on the server side to fag each message), you have to kind of watch out that you don't miss something. Takes a little getting used to, but it's better then some other systems I've seen out there :)

The doctor says I have way too much blood in my caffeine system.