Hmm. Good catch. Post #7 only showed that apache2 folder had the ticket domain and its certs were in Froxlor folders.
I hadn't realized they were showing new domain name and was still thinking Froxlor. I don't know how the wiki domain is being managed (maybe manually?). I see that wiki domain is sending out the cert created today. And, the DNS for wiki points to same IP as ticket domain. Both wiki and ticket were getting Let's Encrypt certs every 60 days for a long time until recently. I hope these observations help them.