I noticed that yesterday's release has a
bug fix listed for this, but I had this same issue last night. I was texting a friend starting around 11pm or so, and after midnight we sent 2-3 more messages. These last few messages appear at the top of the message thread.
The date for all of the texts is showing June 29th, instead of June 28th for the messages before midnight and June 29th for the ones after midnight. The timestamps are accurate, but the dates seem to be what's throwing off the sort order.
Just to be sure it wasn't my install, I deleted the database and reinstalled VoiceCentral and I still have the problem. (I've actually never had the problem before, but I may not have ever had texts that spanned across midnight)
If it helps, I'd be glad to send the Riverturn team a screenshot (but I'd rather not post it on the forums

)