As you can see on the attached screenshot, I only see zeroes where I would expect to see the actual opens. The same applies to when I go to the profiles of members. I see zeroes there too.
I am pretty sure that I have configured everything with Mailgun correctly, because I have been sporadically sending subscriber emails for a couple of months now and everything works fine on the Mailgun side (incl. the analytics part).
Could anyone share an idea why this might not be working? The Ghost version I am running on is 3.40.4