I have successfully used my host’s implementation of Let’s Encrypt for several domains. I tried just now on a new one and it has supplied a certificate for a not-trusted lokacije.ugostitelj.hr by COMODO RSA.
Is this a new problem?
EDIT: I found someone else who has had this problem but received no help: https://www.reddit.com/r/ssl/comments/4wy4xw/why_my_self_signed_ssl_not_working/
EDIT 2: 2 re-issues later, the issue seems to be resolved. Any ideas what happened would still be appreciated.