Outlook and google feeds are not showing all events

I found that events with multiple occurences are not shown in the feeds for google and outlook.

I would like to give my users the oppotunity to use the feeds to keep track of events. If this would work correctly I would even consider giving a donation for this nice plugin, but for now it’s not working for us.

Same problem on a subsite https://r15.dares.nl/agenda/

Please let me know what I can do to solve this.

The page I need help with: [log in to see the link]