Decks are gone after synchronizing

Hi,

I recently changed the name of two of my decks (I just put numbers in front), which had many sundecks with cards in each. Then I have sychronized them as always but suddenly all the cards & subdecks are gone. The only thing that is left are the two deck old deck names.
How can I get my cards back? And I don’t want to try & synchronize on my iPad or iPhone too, because I am scared that this will happen again.

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