Welcome to the Let's Encrypt Community, Yuki 
It means you have had 5 certificates issued within the last 7 days for inrin.net and www.inrin.net.
Renewals are treated specially: they don’t count against your Certificates per Registered Domain limit, but they are subject to a Duplicate Certificate limit of 5 per week. Note: renewals used to count against your Certificate per Registered Domain limit until March 2019, but they don’t anymore. Exceeding the Duplicate Certificate limit is reported with the error message
too many certificates already issued for exact set of domains.
https://crt.sh/?Identity=inrin.net&deduplicate=Y
The problem is that most of the time "recreating" results in deleting the private keys corresponding to issued certificates, which makes usage of those certificates impossible. I recommend creating a new help topic (the same way you created this topic) then filling out the form you are presented as best you can. Please state in that form that you know you hit the Duplicate Certificate Limit, but that you need help getting your webserver configured correctly. We can then help you use the staging (testing) environment to get things working and install a staging certificate to test. Once things are working properly, we will then help you install a real certificate.