Problem with List.GetElementAtIndex

hello everyone,
I am a junior student in Dynamo and I met this problem with GetElementAtIdex
I am trying to get the first element from these 4 lists and I expect to get 4 elements as the result.
Can anybody tell me there are 16 instead?
Thanks

Change level of list to @L2 or lacing shortest.

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Thank you very much!

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