Calendar entries automatically duplicating?

What I did: Use Agenda app across multiple devices, integrated with Google Calendars.

What happened: Every calendar event is duplicated on the MacBook Air. Not duplicated on iPhone or iPad.

What I expected: No duplication.

Things that might be helpful to know (Agenda version, OS and model, etc): Latest version of Agenda, and MacOS

That’s odd, can you send us some screenshots demonstrating the problem?