Pro-Version: month view with shortcode – next or previous month is incorrect

I only want to display events from selected categories in the calendar view. To do this, I’ve inserted the shortcode [tribe_events view="month" category="Freizeit,Bürgersprechstunde,?ffentliche Sitzungen,Informationsveranstaltung"]. The calendar is displayed correctly on the page https://niederau.info/kultur-freizeit/veranstaltungskalender/. The links to the next few months (and then back to the previous months) are generated incorrectly. So it happens that the headline shows the right month, but the events of another month are displayed.
Example:

• The first click on the month “September” (https://niederau.info/kultur-freizeit/veranstaltungskalender/?date=2019-09) shows the heading and the events of the month “August”
• The second click on the month “September” displays title and events correctly
• Click now on forward link to “October” (https://niederau.info/kultur-freizeit/veranstaltungskalender/?date=2019-09%2F&tribe_event_category=Freizeit&tribe_event_display=month&eventDate=2019-10) – heading “October 2019” – but events are from August
• and so on.

In the normal calendar view, the Links will work for the following and previous months https://niederau.info/events/

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