Map (item) and totems

Very noob question here: I recently started using the map item, particularly for totem cleansing.

In some opportunities, the map shows me no totems even if I'm standing next to it or if there's just a wall between it and me.

So: how does the maps works with totems spotting? Does it show every single one in range? Doesn't show the closest ones or something like that?

Thanks for the answers.

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