highlighted classes not added

Hi.

I think i set up everything right but the highlighted classes are not added. I made the links as should be and did everything i had to do.

http://www.merlin.webdesigndiensten.nl.
Maybe it is the way i set up the one page site? I used the home as the static frontpage and there i put the sections for the one page.

if you want my inlog details i will send them

https://wordpress.org/plugins/page-scroll-to-id/