Hi there,
This is a known issue with qCalendarView from a much earlier version (5.6 or earlier) of Quest Web Parts in SharePoint 2010 when the web part is displayed in an IE browser. You can find the details of this issue discussed at https://commons.quest.com/docs/DOC-1930, and try to change the IE browser compatibility mode to something other than your current setting to see the issue resolved.
Yuan