Problem with Let's encrypt SSL certificate

My YunoHost server

Hardware: VPS bought online
YunoHost version:
I have access to my server : Through SSH
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : no

Description of my issue

Today I added two new domains to YNH. I installed Let’s encrypt SSL certificates for both of them through YNH admin panel which seemed to work. However, after opening both domains in my browser I receive these messages:

Your connection is not private
Attackers might be trying to steal your information from [DOMAIN.TLD] (for example, passwords, messages, or credit cards). Learn more

When I click on the red cross left from the URL it says “Certificate not valid”. This is the info from certificate viewer:

For one of the domains I renewed SSL certificate. However, I still got this message. I never encountered this issue for any other domains I added to YNH (~20 existing domains). So, this is new. What can I do to make it work correctly?

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