Strange Wall Contour with Windows

[Anonymous]

There is a problem with the contour of the Wall which AC11 draws around the Window opening in plan. I have a 25 cm masonry wall with 5 cm insulation on the outside and W1 Casement 11 window.

When the Sill Construction Method is used AC breaks the thick line of the masonry with a thin line for the depth of the recess.

Any ideas how to corret this?