My Fixed Side Nav is not working

I designed a fixed nav that lets users jump through content. My problem right now is that the page isn’t fully loaded. When I click “future steps” or “final design” it jumps to the wrong section because the bottom portion of the website has not loaded in.

All I am trying to do is have the page fully load. So no scroll bar needing to update and change length due to new content being updated.

Can someone help me circumvent this issue? Thanks.

Here is my site Read-Only: [LINK]1
(how to share your site Read-Only link)