That's usually caused by time zone settings in WordPress and Google Calendar being different. Please make sure that the time zone settings in both calendars align.
Tip: It is best to select a city in WordPress’ time zone settings. This ensures that it won’t ignore the summer/winter time changes.
Please email us at firstname.lastname@example.org if the time zone settings are the same in both WordPress and Google Calendar, and the events are still not synced correctly.