The Tooltip for graph points remains on the page. Please refer to the below screenshot.
Is this happening simply by moving the cursor within the graph area or when resizing the screen?
This is happening by simply moving the cursor across the graphs on each tab. Maybe you can try to reduce the graph refresh rate to 1 second and try.
For me, it's working fine if I move the cursor within the graph area, but I can also sometimes observe this glitch when I attempt to change the screen width and quickly move the cursor within the graph area.