Mulled Windows Issue

[johnny]

Every so often windows refuse to mull together correctly.  Here is a recent example on a current project.  Does anyone know what setting might cause this?

 

Here is the sectioned area with the windows and some pictures.  Thanks for any help.mull_issue.plan

mull_issue.zip

[johnny]

23 minutes ago, solver said:

 

What is "correctly"?

 

 

I'd say not offset from the outside casing...but i know there is typically a small offset chief shows (which i'm not sure of the logic there), but what I have now is nearly void of material thickness in-between the upper and lower window.  On your blue example to the right it does appear less drastic than the left...but when I mull the top and bottom window in the same file i get the same error.  Are you doing anything to get a different result?

[johnny]

1 hour ago, solver said:

 

Interesting - thank you very much.  I guess in my mind I was mulling to get the casing to work, so I wasn't imagining this to be a mullion - but obviously by the operation that is exactly how Chief views it.  This was very helpful.