Snap points near but just off of ortho can cause wall or other input to be out of square. This is an acute problem when tracing a busy PDF image.
In BC Framer® software, you can choose if Snap points will override Ortho or vice-versa when drawing walls or lines.
To change this setting: go to File > Setup > Program Settings > View & Selection: Ortho Mode > Ortho Overrides Osnap = "Yes" (Recommended setting)