Good evening Bruno and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
We are sorry to hear about the selection bar displaying under the filter bar on your installation.
I would love to help you with this topic.
I just went to http://solothurner-choere.ch.lava.ch-meta.net/events/ and it seems like you have moved the filter bar under the search bar. In other words I am unable to see the issue for now.
Can you tell me if you fixed this already ?
If not, 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/
Best regards,
Geoff B.