Hi.
I don’t know why this is not visible in your browsers. The code that I showed in the screenshot should obviously call scrollbar.
Maybe you should clean the cache or turn OFF the thin scrollbar in the Chrome settings, since overflow-y: scroll; simply cannot but cause a problem.
I see this in any browser.
Here is from Chrome

Toufiq I'm sorry to say that, but it is very difficult to report bugs when I have to constantly prove to you their presence. And you ignore obvious things. You spend my time in wasted. Please invite Paul Frankowski here. This is the most adequate person in your support service.