Arena reverts all changes to decks.

I modified 20 cards from one of my decks more than 24h ago AND i favorited that deck AND i played with the new version of it at least 3 times so i know for sure that the changes were applied and playable.
Today, when i open my decks tab, it's the older, non favorited version that appears and the new version is gone.

This is the second time i notice such a bug happen in my collection. The last time i noticed it was 1 or 2 months ago.

This is very annoying. I don't want to have to screenshot every deck i modify and then compare my lists to my screenshots every day.