So who else experiences this same upwards and downwards scrolling complain?
Honestly it's unlike it used to be. Although I don't experience it while using the mouse with my laptop.
And I don't experience this outside the forum.
I have been here since 2021 and I never faced such an issue although sometimes it gets a little hard for me to navigate on the smartphone but I did not see any king of lag or gitter or any other kind of mis behaviour while scrolling up or down. And AFAIK if scrolling down is working fine then scrolling up should be working fine as well. Maybe you are seeing this problem due to some other reason, like the nature of the browser, or internet connection, or cache problem. I am using Google browser and it worked very nicely and smoothly.
I will also try to ask from my local community if any of them has faced this issue then I think its a legit case on some of the devices. It should be a cache problem or browser problem. It can't be website issue as far I know its not javascript based.