Calendar unable to add holldays

Hello, In the standard calendar, I am unable to add holidays. When I try to add Christmas for example, the day is entered with a relation to Easter Monday and therefore does not appear in the calendar. In previous versions I did not have this problem. We are in the latest version. Thank you for your help. 
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Same issue here, when I click "Add bank off days to calendar" only the 21st of April is added to the calendar.

 

Thank you for the reply. I am unable to remove "Easter" from that field. I can edit the day, leave the field blank and when I save it says "no changes" and doesn't save anything. When I leave the field blank and change something else it still shows "Easter". Even creating a new off day will prefill that field with "Easter".
There are no errors in the browser console or server side logs.