Hello damien, greetings.
I was going through my collection today and i found 772 cards with an ease of 0%.
I don’t know how it happened, I just discovered it incidentally.
Also in the past few days whenever ran the ‘checked database’ on AnkiMobile or AnkiDesktop, it would fix 5-6 cards with invalid properties most of the time.
I am on latest versions of both.
Please help, thank you.