Lost most of my edits after catalogue upgrade

[Gymmli]

Hi,

I recently upgraded to v13 and updated my catalogue accordingly. I just realized A LOT of my edits over the years are just missing, I see my photos correctly but edits in some folders are completely missing. For example, in my folder `2019-12` and `2019-08` everything is fine but in `2019-10` all my edits are missing.

I have a lot of backups on my computer, some of them have the edits for `2019-10`, even after the catalogue upgrade to v13, but I'm missing a lot of recent changes if I use this backup.

Is there a way to understand what's happening here ? And is it possible to get the edits from a specific folder in a specific catalogue and import them back in my current (and most up to date) catalogue ?

Thanks,

[Sean McCormack]

How many catalogs do you have? Is it possible at some point you opened an older copy without knowing? Lightroom doesn't randomly throw edits way, so this would be very unusual behaviour for it.