Section jumps again when already on the section and re-click the same section link

On the homepage, when we click on ‘works’, the page jumps down to the works section. The page hasn’t arrived at the right place of the section because the container for theworks sections starts right below this line.

When we click again on ‘works’ from the nav, the vertical line is gone (great!) because the section shifted up a bit. Should this second shift be happening though? We thought that if the page had jumped to the right spot in that section, a second click on that section link wouldn’t trigger anything…

A short video of what we meant is Here

A similar thing happens when we click on ‘About’ from the ‘Contact’ page.

How can we prevent this weird second shift??

Thanks!

Our read-only link is here