Pressure altitude around SL in this case (EGSS, RWY 04, Q1026). LW = 32000 pounds. HotStart FMS gives Vac = 121, whereas AFM gives Vac = 129, as you can see from the table above (consistent with the real FMS and the performance sw I use). On the other hand, Vref = 121 is ok among HotStart FMS, AFM, real FMS and Perfo SW.
PS unfortunately I do not have a picture of the real FMS at hand, and cannot share screenshots/details of my Perfo SW. Anyway, AFM is the reference to be considered here