The calendar fails to display correctly when added or used on a Confluence page when published. But, when in edit mode on the page, the calendar will display correctly.
Published page, all the events are pushed to the left.

When I enter Edit mode for the page, all the events are properly appearing on the dates planned.

Confirmed with several people and they are seeing the same, when in Edit mode all is fine, but looking at the published page, it is all pushed to the left.