The only time i have seen something similar is when the Mass was very thin and the click to place was actually picking the wrong face of the mass also for more complex Mass shapes the flip option is not available
As a test i created 2 Mass shapes, one a simple box and the other a twisted box. Both of these walls are identical but for the twisted face the Additional Modify options of Editing Profile, Wall Opening, Attaching to Top/Bottom and Flip via space or arrows are not available due to the complexity of the Mass it is associated on.

As a check see which Modify options are available between the flip and non-flip walls
Jay Colcombe
Autodesk Certified Instructor
Revit Architecture & Structure Certified Professional
AutoCAD Certified Professional
B.Sc. Hons Civil & Structural Engineering
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