Solved! Thank you @abdullahramzan!
Hi!
Thanks for your quick reply, I’ve filled in and sent the form now.
I haven’t done any changes recently. Only thing is: A week or so ago I de-activated the plugin “Google Analytics for WordPress by MonsterInsights”. After that, or maybe for another reason, Google Analytics didn’t show me proper data (even on analytics.google.com/), so I decided to active the plugin again in case that cased the issue.