Dear Arsalan,
Your mode shape coefficients do not sum to one e.g. for the 1st SS tower mode, -0.1911 + 1.1843 + -0.0246 + 0.0109 + 1.0204 /= 1. From the related forum topic you’ve been posting in (Tower (and blades) mode shapes BMODES vs. FAST), my guess is you are copying the incorrect cells from the ModeShapePolyFitting.xls spreadsheet. My guess is your grabbing e.g. M9 - Q9, but these coefficients are not normalized. Instead, you should grab e.g. E6 - E10, which are normalized.
Best regards,