Entire year duplicated - how did this happen, and how to reverse?

Over the last few years, in his advancing age, my father has started to meticulously clear every manually-entered transaction so that he knows what he has confirmed and what he still has to examine.
He renewed his subscription in April. I helped him download and install the latest Quicken Classic for Windows onto his system.
On the 28th of May of this year, an entire year’s worth of records inside of a single chequing account were mysteriously duplicated - without the cleared flag - down to the very day. He realized this around the 30th of May. He swears that he did absolutely nothing different than what he normally does.
I have gone through that one account, and exactly one year’s worth of transactions - from 2024-05-28 to 2025-05-28 were copied, precisely and with no omissions whatsoever aside from not having the cleared flag.
I would like to know how this could have possibly happened, but more importantly - how can this be reversed? He makes backups quarterly, and the data file is stored on Sync.com, so I can go back and blanket-reverse it to a day previous to that, but I would prefer to know if there is a one-step procedure to back this change out.
Answers
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Quarterly backups? That's, um, extremely suboptimal. I make backups daily and so should he.
So in this case, if it's only one account affected, I would set the account register to sort by Order Entered. See whether that puts all the duplicates transactions at the bottom. Then select all the duplicates back to the correct date and delete them.
Quicken user since version 2 for DOS, as of 2025 using QWin Premier (US) on Win10 Pro & Win11 Pro on 2 PCs.
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Following along @Rocket J Squirrel comment, you can also sort the register based on Clr status. That would put all the uncleared (blank status) transactions at the bottom for easy selection and group deletion.
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