Walls on 2 different levels joined?

By highlighting a wall and right-clicking > Select Joined Elements, you can select and highlight all walls joined on the current chain. 

If you come across walls on varying levels being included in the same selection, when not directly overlapping the other walls, I want to show one scenario where this may occur and how to resolve it.

The selection may look similar to the image below after utilizing Select Joined Elements on one wall:

Typical scenario is that when the walls were initially added they were overlapping geometry between levels.  When modified later to be associated to another level, or the offsets were modified, the walls have remained in a joined status. 

Should you come across this behavior, you can simply Cut & Paste Aligned one of the level's walls to the same place to reset the association.  The walls should then appear similar to the image below: