While I was reviewing my cards in a single deck today, I clicked “sync” with 103 cards left to review for the day. After the sync processed, the number of reviews left decreased to 63 instantly.
I checks the # of cards I had reviewed for the day in the “statistics” tab (266 cards), and I remembered that there were ~380 cards due for the day at the beginning of my session. That means I’m missing at least 51 reviews that were initially scheduled after clicking sync (266 + 63 = 329; should have 114 left for the day).
I immediately checked ankiweb, and the amount due matched what the Anki desktop app was reporting. Same on my iOS version. I had not used the mobile version in between syncs. I turned off all add-ons, with no change. I do not use any admins that are supposed the affect scheduling.
I have been unable to reproduce the issue.
Figured I probably would not be able to get an exact answer on why this occurred given the lack of reproducibility, but any tips on how to avoid sync issues like this in the future would be very appreciated! Just scared of losing a ton of progress, or even worse my collection.
Thanks for any help provided!!