Problem with FCPX

I shot some clips with my Sony A7iii, some in 30fps and some in 120fps but,; the first are shown 29.97 in the info tab but the second ones are showed as 60 FPS.

When I insert the 120fps clip in the 30fps timeline and click on the automatic duration, everything is correct as it is slowed down at 25%; so why in the info tab there’s a 60?

In case I shot some clips in 60fps as well, how can I tell the real 60fps from the 120?

Thank you for helping me,

Fabrizio