Horizontal Scrolling in Safari

I have a problem with my website that is limited to Safari and therefor every iOS-Device. In every other browser the problem is non-existent:
When I open up the page in Safari, everything looks fine, but, for some reason, it is possible to scroll horizontally, to the right to be exakt. That shouldn’t be possible and isn’t in every other browser (Firefox, Chrome, Edge, Brave, …)

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