To reproduce (I’ve found it with Chrome, probably happens with other browsers,too):
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select “year view”
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shrink vertically the browser window and make sure a vertical scroll bar appears
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scroll to the bottom of the page with the vertical scroll bar
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hover the mouse on one of the calendar events: the associated tooltip appears way below the mouse pointers (often it appears so much below it is not visible at all)
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scroll to the top of the page and hover the mouse on one of the calendar events: the tooltip appears correctly