Sounds like we need to take a closer look internally.
As you've said, just editing the post multiple times should never lead to it creating a new post, so there may well be a bug in the server-side logic that needs uncovering.
I've taken a snapshot of the DB to investigate with, so feel free to delete one of the two posts now -
we'll let you know if/when we discover anything.
EDIT: This is the sequence of events, seems the initial submission happened twice before the editing.
| ID | Created/Edited UTC | Reason
-----+----------------------+--------------
3263 | 21 Jul 2018 02:14:58 | Initial post
3264 | 21 Jul 2018 02:14:59 | Initial post
3264 | 21 Jul 2018 02:17:26 |
3264 | 21 Jul 2018 02:21:38 |
3264 | 21 Jul 2018 02:26:52 |
3264 | 21 Jul 2018 02:26:58 |
|
The reply by nj was on the 3263 post that hasn't received any edits, so to preserve the newest state the 3264 blog contents may need to be copy/pasted over to 3263, then 3264 deleted.