Section Wizard - Properties Error?

I'm looking for some help with Section Wizard, release 00.20.-999 (STAAD.Pro V8i SS5 20.07.10.65).  Using the Section Builder module, I created a custom section using two HSS 4 x 4 x 1/4 square tubes joined side-by-side.  The calculated results for "Plastic modulus" and "Distance to equal area axis" don't seem correct. 

To troubleshoot, I re-created my section with the two HSS tubes in a vertical stack.  Since my section is doubly symmetric, I anticipated getting the same result values with the U/V and X/Y directions switched.  But the items mentioned above have drastically different values.  They actually look more correct in the vertical arrangement model than the horizontal.  But why aren't they identical (or at least very similar)?  Is this a software problem, or do I just not understand the results?  See two results printouts below.

Steve