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When determining the deflections on extreme shearlines to derive the Bx from NBC 4.1.8.11 (9) for Irregularity 7 – Torsional Sensitivity, the program was failing to identify those exterior wall lines that do not have full height sheathing, so are not in fact shearlines. It was assigning zero storey drift at the building edge in those cases, which also caused the program to be more likely than it should assign a high Bx.
Now, if the outermost wall lines do not have full height sheathing, the program uses the next closest shearline with full height sheathing, which may in fact consist of interior walls.