Check your Model View Option settings.
There is an option in there to show the 3D of doors and windows as 'Full'.
I have no idea why it is set to 'Simple' as default - this confuses a lot of people as in the object preview when you are setting them, they look fine.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11