Events have wrong timezone

Im using Evolution Mail with calendar events and appointments from a WebDAV server. I create and edit the calendar events on several devices (Android Smartphone, Android Tablet, Outlook on Windows, Evolution Mail on Linux). The events are shown in the correct time across all devices, except in the Elementary Calendar when I click on the time shown in the top panel.

Example: Appointments which are created in Evolution Mail in my timezone GMT+1 at 8am show as 10am in the Elementary Calendar.

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