I really need the drawing so I can select the dimensions and see the attributes and how they relate to the rest of the drawing. A picture is a good start but the drawing would be more informative.
I can now see that it is not a bottom MTS view because the left to right orientation of the dimension is not a reverse image, I can only re-create the backward and upside down dimension by rotating it. I don't think you are doing that and If it's a program bug, then there would be several complaints about it here.
There is only one workplane in 2D and that is the page that you are drawing in, all you have is the X and Y axis.