Does the Export Data function work? When I export a date range as an iCal I only have a single week even though I have a range set for the entire month.
I am afraid I have no solution for you, but just for info: I set my parameters/tick boxes just like you did, even changed to English (I don’t think language matters here, but anyway), and I got a correct ics file with 4 meetings.
The only difference I could find, is I did this on a Win10 Pro.
As a workaround, not a solution, could you get the ics files you need for each week by changing the range to just one week?