Unable to get 120fps for 24fps video

Hi there,  I set up SVP profile to fix on 120fps, however when playing 24fps video, it shows as strange 72fps (x3) see below pciture 1,
the profile is set as picture 2,
with exactly same profile and vlc player,  playing 60fps video it goes to 120fps as expected (see picture 3).

what's going on and how do i make 24fps video to go to 120fps

additional Note
1. i also tried to set profile to match screen (120hz) no difference
2. i do have two monitor, one 60hz, one 120hz, but i am using 120hz as main display with all svp windows, player window and everything on this monitor so i don't think it has anything to do with dual monitor set up.