Hi @Daniel Seiler ,
It looks like the assumption that "Top" is a vertical or Y axis measurement is incorrect. The fmPosition struct matches the Windows API POINT structure (x then y). For fmPosition, the correct interpretation is "Top" means horizontal and "Left" means vertical, i.e. "Top" means the position along the top (horizontal) edge of the bounding box and "Left" means the position along the left vertical side of the bounding box.
Does that help to clarify the meaning?
Microsoft Open Specifications Support