Hello Glenn! Shadows are based on the origin, not necessarily the axis. In other words, if you changed the sketching context using the axis tool, that won’t affect where the shadows land. I would recommend unchecking “On ground” within the shadows dialog… Then draw a rectangle to represent the ground plane. Personally, I never let the shadows cast to the ground…
I just read your question again… Maybe you want “On ground” checked on?
Let me know if this helps you get to the bottom of it!