[مغلق] Homepage suddenly shows in English in stead of Dutch

Background of the issue:
Today, I suddenly found the homepage in English, whereas it was and should be in Dutch.

I checked a few things but couldn't find the cause. The URL is still the Dutch one, and I've followed the necessary steps on the troubleshooting page.

I cleared the cache everywhere, but that didn't help either.

When I edit the English translation of the homepage, I can indeed see the Dutch language on the left in the advanced editor. So, the Dutch version is present but doesn't seem to be assigned to the Dutch page by WPML. Given that this is our homepage, I urgently need assistance with this.

Symptoms:

Questions:
How can I get my Dutch page back?