The different Headings/Sections on the page need IDs so that they can be linked to from the Menu.

Each of these sections needs an ID.

What you will need to do since there is a sticky header (photo below right shows why), is to add an anchor element before the heading or section: "<a class="dpi-anchor" id="section-name"></a> and define some CSS for the class ("dpi-anchor" in this case, choose whatever) that has the following attributes:

a .dpi-anchor{
display: block;
position: relative;
top:-120px;
visibility: hidden;
}

The id will have to change for each item.

The sticky Menu is what screws up the normal way of doing it and I showed what happens in the photo on the right, by adjusting the opacity. KB and I are working on a more long-term solution that we can add to the parent theme.

Let me know if you have any questions. It is hard to state without showing.