Multisite problem

I have got a problem with multisite.

The problem that im getting is i installed and set every setting right according to this site: https://www.skyberate.nl/blog/2013/03/opzetten-van-een-wordpress-multi-site/ (It’s a dutch site)

But the problem is now that when i go to the homepage it works but when i try to switch to a diffrent site or dashboard i still go to the main site.

Example:

Site1.nl
Site2.nl

Klik on site2.nl i go to site1.nl klik on dashboard of site2.nl i go to site1.nl

Any 1 knows how to fix this?

Thanks.