Stacks ruined when importing decks from others

Hi there,

I imported maps to Anki. Now almost all of my stacks are showing up as empty. If I click on this (supposedly) empty pile, I am immediately informed that I have finished studying. However, all cards are still available under card management.

Unfortunately, I did not export the previous state before importing the new maps. What am I supposed to do now?

Thanks in advance for your support.

Take a look here. Does this explain the problem?

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Many thanks for your response.

I am still unsure whether the problem was really only the “spaced repetition” algorithm (since many of my stacks were shown to me as empty, which I had not gone through on that day) but in fact all stacks are today again available.