Compare the total weight (multiply mass by ( g )) against your hand calculation. If the ETABS total is 5,000 kN but your Excel sheet says 7,500 kN, you likely forgot to include cladding, finishes, or the live load percentage in the Mass Source.
High mass on a soft story (e.g., heavy parking level with open ground floor) is a collapse risk. Identify this in the summary and re-evaluate your stiffness. etabs mass summary by story