Plugin "Daily Routine" Todo is entered postponed by one day

Hello,
I have a problem with the “Daily Routine” plugin:
If I enter a todo on Sunday, it appears in the overview on Monday.
This is both under “Note” and under “Calendar”
Set as the start of the week on Monday. I use the app with the European setting for time and date.
What could be the problem?
Thank you for your help.