Hey Veruska, thanks for following up!
When I try to get to the events page I get redirected to the homepage of the site so cannot see the actual Facebook URLs to test this.
As stated before I couldn’t find any reports or occurrences of this same issue (I’ve shared the case with the team but they are not aware of the issue). I did find an issue in Event Aggregator causing the image import of Facebook Events to fail. Do you think the mage you are seeing might be a ‘fallback image’? If you browse the events in the back-end do you see they have this image assigned?
Please let me know about it,
Best,
Nico