I've taken over the task to maintain the website of your orchestra. Unfortunately the previous maintainer installed quite a lot plugins so it's hard for me to figure out which plugin is actually used for what.
Now I have to figure out, why in our main menu the scroll-to-links are broken but I don't even know where to start. The html looks correct:
Whereas the link https://www.akkordeonorchester-muenchen.de/#orchester-neu works perfectly fine.
So I looked in the Google Chrome Console which throws Violation Warnings like
[Violation] 'requestAnimationFrame' handler took 107ms
As far as I know, "scroll-to" is done by jQuery "animate" function, so this might be a hint on where to start fixing the problem. But the website uses a child-theme of Simple Key Theme and as far as a I know, there is no custom code so far. I don't mind adding custom code but as I said, I don'T know where to start looking for the error.
I provided a link to the website above, so please don't hesitate to have a look at the live website yourself. I'd be happy about any hints!