This is how I found out I got a bad strain of COVID after getting vaxed. Sleep through a rough fever, next day all good, except muscle pain; it lasted for 2 weeks.
Years later I get antibodies checked I developed antibodies for a strain that didn't exist when I was vaxed, that episode happened 1y later. Yup, fevers are the best.
But this still doesn't explain it. Like OP I also use a wildcard cert. The subdomains are never exposed.