@alphanet
The symptom could happen from various reasons.
Where the URL of the calendar comes from? Directly from Google calendar? or another source? If the calendar would be imported from another source and the original event might lay in a different timezone, it could happen.
Or simply, your events have a wrong(or unparsable) timezone format.
Anyway, you can adjust the timezone of events by force with forceLocalTZ:true
on calendar
section (https://github.com/MMM-CalendarExt2/MMM-CalendarExt2/blob/main/docs/Configuration/Calendar.md). It will override timezone information to your local timezone by force.