Possible bug in navigation bar in List View

I have two List-View versions of my google calendar, one for printing.
Both display this issue.
The calendars are set for “This Month” and when first called, they display the current month beginning with the first of the month. ie. Today the calendars initially begin with May 1.

However, after navigating ahead one month, the first day is displayed as June 2, with the events for June 1. The next day shown is June 2 also, with events for June 2. Upon returning to May, the first day is now displayed as May 2 with May 1 events, followed by May 2 with May 2 events.
Moving back to April, the first day shown is April 4, with April 3 events, followed by April 4 with April 4 events. There are no events scheduled for April 1 or 2.

Thanks.

https://wordpress.org/plugins/google-calendar-events/