Hi there -
That is certainly unexpected!
1) if you have auto-sync on startup set up, make sure you have
accepted the new terms and conditions on ankiweb, using a real
browser
2) make absolutely sure that AnkiDroid has storage permissions enabled using android system preferences to list the apps and check into ankidroid settings
3) if that still doesn't work, perhaps something here will help: https://github.com/ankidroid/Anki-Android/wiki/FAQ#lost-my-cards
-Mike
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