Now there is no scroll bar. I did not change any settings – which is the strange part.
I have an identical website in another language, and the problem is not occurring on this one.
Thank you for helping me recover the scroll feature in the results box.
Ian
The scrollbar script was recently switched to a different one, so I am guessing it is only the browser cache. By default, that scrollbar is hidden, until the user hovers over the results, or starts scrolling: https://i.imgur.com/5hRPI10.png
Clearing your browser cache should fix this issue immediately. You can also change the scrollbar appearance, to show it all the time: https://i.imgur.com/x2INFSH.png