The wheel adjusts the volume of 1 dB, and the pointer 0,5 dB. In the settings Volume step (dB) = 1 dB. The volume control in the status bar and the main Volume Control behave differently at a volume value of 0.5 dB. In the status bar, the volume is reset to integer values. Basically, Volume Control is regulated by a fractional 0.5 dB, although it is added by 1 dB.
It is possible that with the setting Volume step (dB) = 1 dB, the volume everywhere is regulated by the whole 1 dB and no fractional 0.5 dB, i.e. 0, 1, 2, 3, 4, 5 ... When setting 0.5 dB, the volume was adjusted by 0.5 dB - 0, 0.5, 1, 1.5, 2, 2.5 ...? In the status bar and in the main regulator.