Good evening Bernhard and welcome back!
Thank you for reaching out to us.
We are sorry that you can’t switch to the next month on the mobile view.
I would love to help you with this topic.
As a first troubleshooting step, could you please provide us with your complete system information in a private reply using the instructions found in the following link?
https://theeventscalendar.com/knowledgebase/sharing-sys-info/
Secondly, I just went on your website with a mobile phone and I was able to navigate to the month of November successfully in the month view.
Can you confirm if your problem persists or if something changed since you first reported the issue?
Best regards,
Geoff B.