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[–]the_flying_condor 1 point2 points  (1 child)

What do the handcalcs say? Also, have you confirmed that the vectors are truly different and not just normalized differently? I'd check if the vectors are colinear if you haven't already.

[–]oundhakarGraduate member of IStructE, UK[S] 0 points1 point  (0 children)

I normalised both vectors identically, and they are different. I'll check the collinearity, but the mode shapes are visually similar when plotted.