Tile Maps from other Levels Displaying

Here are a couple screenshots of the World Outliner. I’ve filtered it with the word stage to simplify it.

First, here is the World Outliner in normal editor mode:

89951-in-editor.png

And now here it is in Gameplay… Notice tile maps from Level 2 are now loading in. Why is that?.. and how do I prevent this?

89952-during-gameplay.png