Complex frequency result confused

I tried a complex frequency card regarding a simple rotor, where the first two modes are first order bending modes (39.1Hz), and followed by two second order bending modes(147.8Hz). When the applying a complex frequency card with Coriolis parameter, I would expect the natural frequencies corresponding to modes 3&4 to have larger difference from the ones at normal modal analysis, however, in my test it seems that the modes 1&2 have larger deviation, and it confused me.
Comments are appreciated.
PS: ccx_2.17 was used.

It seems ANSYS has a reasonable result.

Would anyone share some experience on the complex frequency card please? Thanks.