This bug wad fixed on 12.5.3. But it seems like it appears on 14.3.
12.5.3 Release Notes: Addressed an issue where the Lift, Gamma and Gain control on the Resolve interface do not maintain Color Balance.
You can know more about this here: https://mixinglight.com/color-tutorial/panel-vs-mouse-color-correction-math-davinci-resolve/
I generated the similar gradient. Can you please test it on your systems?