This issue was reported by Scooterlam in 2021 and fixed by removing and reinstalling. I am having the same issue. I have removed and reinstalled Q Classic Primere and it is now R62.16 Build 27.1.652.16 but the problem continues to occur. I have two monitors of different resolutions and it acts the same on both. I have rebooted. The duplicated material is displayed around the box that contains the information extracted during the mouseover as though the box was a brush painting the screen.
This is the previous post which has screen shots.
R31.12 Mouse over in Investing performance charts give strange screen painting/duplication effect