Double click doesn't correct path

When double clicking to add an event on the calendar the path isn't stripped back to the correct value. For example, my calendar is displayed in mysite.com/group/1/calendar. If I click add event I correctly go to

mysite.com/fullcalendar-view-event-add?type=bookings&start_field=field_start_date&end_field=field_end_date&destination=/group/1/calendar

However, if I double click on a date to add an event the link is to

mysite.com/group/1/node/add/bookings?start=2018-06-16&start_field=field_start_date

instead of

mysite.com/node/add/bookings?start=2018-06-16&start_field=field_start_date