Honestly, you've got a big issue on your site. Every page I just looked at has the following html tag:
<link rel="canonical" href="https://www.opgroeigids.nl" />
That's telling every search engine, social media site and anything else that scans every page of your site that it shouldn't be looking at the page it's viewing and should instead redirect the user back to your home page.
You really need to fix that problem, which will also fix the og:url issue if the canonical link is correct.
For more information on canonicals, see:
support.google.com/webmasters/answer/139066?hl=en
Alex