Why the storage size of database "local" seen in the shell and the compass are different?

Hi, in the lecture “Connecting to Your Sandbox Cluster from Compass”, we are guided to connect to the atlas server via shell and compass. I noticed that the size of the database “local” in the shell and the compass are different: in shell, it’s 4.863GB and in compass it’s 0K. And neither of them are accessible. Could anyone explain why there is such a difference?
In the shell:
image
In the compass:
image

There is no reason why Compass and Shell should say something different. so maybe:
You are connected on a different cluster
or
Maybe you are connected on the same cluster but between your connection in Compass and your connection there was an election (or you have different read preference) and you are on the same cluster but on a different node.
or
not much MY other ideas, but should be the same size.

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