I have found the reason. It happens to all audio clips that have a gain automation in the clip container.
With no gain automation, the volume digits in the inspector scrolls perfectly linear, when dragging slowly up or down. With gain automation the scrolling of the volume digit in the inspector is becoming glitchy, however, the automation line is moving perfectly up and down in parallel. I think the routine catches and represents any volume number that lies on that automation line, shouldn't it show the relative change?

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