Concrete and Wood attach?

[Mike Sealander]

Honestly, why does a concrete wall attach to a wood wall? What does that mean?

[david_peterson]

It means you used nails or glue to attach the wood wall to the concrete one.
Unless you mean to say that they've joined. If you think they are joining, I'd check the materials of both walls to make sure they are different. Next I'd duplicate the view and see if they still look the same at a fine detail level.