From the Reddit cross-post:
Danika_Dakika:
Thanks for posting the Card Info!
Do you sync multiple devices? This mismatch – some of the Card Info knows about the review yesterday, some doesn’t – is almost always caused by a sync conflict.
Are you strict about making sure you sync when you open the app AND when you close/leave the app, on every device, every time? If not, when Anki merges conflicting data, the most recent changes can dictate the state of the card. In this case, that could be that at some point after you studied the card – 12 Jan 21:31 – but before you synced that review history, you made some change to the note/card on another device.
mistcurve:
I do. I try to be careful about the syncing though… Is there any way to confirm that this is the cause? I’m not sure if there’s a merge conflict log for syncing or something similar.
There isn’t a log. If you really want to check this card, you can search it up using the Card ID in your screenshot – Searching - Anki Manual .
I would first look at the Note Modified and Card Modified times, and compare those to that study-time in the Card Info. In the most simple scenario, Card Modified would match that time (because it is updated when the study is recorded), and Note Modified would be before that time. Are you seeing anything different than that?
Another thing to consider are add-ons that make bulk modifications to cards, like automatically rebuilding Filtered decks.