Categories are not scrolling in filters area. Cleaned cache several time but still not working.
https://prnt.sc/9L-G0gEYHC8g

in demo working well, but on my domain scroll not working.

Could not reproduce.
Please share your url.

found the problem.

https://prnt.sc/NiiGeDnnD9pE

from this :

.cat-box .cat-one {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 60px;
    background: #fff;
    display: none;
    padding: 14px 10px;
    overflow-y: auto;
}

i changed to this:

.cat-box .cat-one {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 60px;
    background: #fff;
    display: none;
    padding: 14px 10px;
    overflow-y: auto !important;
}

Interesting, maybe you use jQuery 1.0? (Settings > General)