Funny, I was literally just revisiting this problem myself.
I originally posted about it here.
The problem is in 3D (section & elevation), the window reveal is offset from the opening line reference in the complex profile.
The 'Symbolic' floor plan display view of the window does not match this 3D position.
You need to switch the floor plan display of the window to 'Projected with overhead' so it matches the 3D.
Problem is this looks awful in plan - I want to see the window with the symbolic 2D view.
I am playing around at the moment adding an offset parameter in 2D, so I can match the 2D symbolic position with the 3D position.
It seems to be working so far, but I have my own custom windows so there is no problem in me editing the scripts.
You could try adjusting the position of the opening reference line in the complex profile.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10