I am having the same issue as this member in #1 of his question: https://theme.co/apex/forum/t/2-issues-one-page-navigation-collapsed-menu-scrolling-effect-for-one-page-navigation/2916?u=donwattz1459
I am up to date on everything as well and only have one plugin activate and it is gravity forms.
On this site: http://dev.rrootcoaching.com/