Structural - defining new section name - height/width

When placing a Concrete Beam, I get the option to choose a section by "recent", "library" or "new".

When defining a new section, you define the Dimensions (____ x ____) in mm's.

I notice when I enter 2 values, it's not fixed to define the 1st one being the width and the 2nd being the height. I have the feeling the program choses this randomly?

This causes the need to change the placement point and rotate the section, and (in case of changing an existing beam) the need to rotate the changed beam by 90°.