scottdlieb:
I think this is an Model View Options (MVO) issue, look at MVO > Stair Options > Stair 3D and Section/Elevation: use
Full rather than
Schematic.
You should add a Signature to your Profile (click the Profile button near the top of this page) with your ArchiCAD version and operating system (see mine for an example) for more accurate help in this forum.
David