FCP Gamma vs Color Gamma strange who do i trust???

Grading in Color
Sending back and fourth from FCP.
I have noticed my Color bars pluge is far off in difference when i view it in FCP vs Color
Same monitor same size image same everything , I would expect no change in any of the bars but, its a huge difference
Which can i trust you can grade in FCP and correct how ever I cant trust my monitor at this time because the gamma looks so different.

Much brighter in FCP than in Color

Any ideas?
This is nuts.

Trust a calibrated broadcast monitor. Anything else is just a guess.