M121 wrong result for optional lab

The lab result failed to take into account duplicate values even though the task clearly states they need to be filtered out.

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Hi @Brunilda_Metaj, welcome to the community.
Can you please specify the chapter number and the name of the lab in which you are facing this issue?
Also, are you using the same dataset that is provided to you in the first chapter, you can find the same in the first question of this list of frequently asked questions:

If you have any doubts, please feel free to reach out to us.

Thanks and Regards.
Sourabh Bagrecha,
MongoDB