The scroll behavior isn't smooth after updating to macOS Sierra

Hi! I know how the scrolling should work. Everything is fine on regular webpages, document, etc.

What I mean is the scrolling in pop-over lists - see my screenshot. (taken from http://www.doyouspain.com/mietwagen/)

It's fine working with FAST movements - but not when trying to scroll line by line to select a row.

? Can't find a hint for my problem...

Are you you using macOS and opened the page: http://www.doyouspain.com/mietwagen/

?

all is working fine... like ever before.

it's just the behavior in the sub-list.

I try to explain what i mean...

I open a webpage, and then there is a picking control with a long list of choices.

If I scroll trough a webpage, it's fast and smooth and real "Apple-like". But the picking-control is behaving in a different way. I can't scroll slow, and line by line, i can do fast scrolling and picking an item with the mouse, but i can't scroll with the highlighted value under my cursor. Easy selecting he next value.

Ok, found out that this behavior happens in other apps, too:

e.g. in Affinity, when selecting a font.

I can scroll through the list and pick one value with one finger, but in the past I opened the list (dropdown) and kept my cursor in one row, scrolling with two fingers up and down until the right value was under the cursor.

When i try it now, the list doesn't move or moves more than one line.