Not much to go on with that screen print.
Post numbers may have helped.
But anyway.
the postings are so old that it possibly could be anything.
ID242 eluded to a issue but it could also be simply a merge user issue.
Or a upgrade issue.
The odd part is the replies are out of order for recipients.
1 then 2.
Then 2 and 1.
Could simply be a matter of the other user removed themselves from the topic and just replied from memory of the subject and added RE:
Duplicate subjects are allowed
Not knowing the history of what versions you upgraded to when and why!
I know you are on the current version.
But the user is stating that it is from 06/2009.
So it could be a past bug fix that has been implemented and fixed.
Anyway.
I don't see a real way to fix it other than a try at what ID242 suggested.
Make a backup. Run the re builders and see if the issue improves.
Probably not though.
