cannot get smooth scroll to work

Hi there,

Site: https://cashhomebuyerpros.com/
Issue: smooth scroll not being smooth

I have my smooth scroll set up done correctly with my custom links and hashtags, and it will snap to position but not smoothly scroll to it. Kindly assist me with troubleshooting. On my visible menu, the two things I want smooth scroll for are "How It Works" and "Why Sell To Us".

Custom Link for each in main top menu:

https://cashhomebuyerpros.com/#howitworks
https://cashhomebuyerpros.com/#whyselltous

HTML anchor on each block:

howitworks
whyselltous

Additional CSS class in each block: smooth-scroll

What am I missing to make the scroll smooth? Can't figure it out! I used to be able to get this to work properly.

Thanks,

Liz