DuckDNS Let's Encrypt Certificate expired

I have the DuckDNS add-on installed and configured like so:

{
“lets_encrypt”: {
“accept_terms”: true,
“certfile”: “fullchain.pem”,
“keyfile”: “privkey.pem”
},
“token”: “************”,
“domains”: [
my.duckdns.org
],
“seconds”: 300
}

When I try to access Home Assistant the browser is telling me the SSL cert is expired (Nov.24th), but the logs for the DuckDNS add-on say the certificate is good until Feb. 23:

INFO: Using main config file /data/workdir/config
Processing my.duckdns.org

  • Checking domain name(s) of existing cert… unchanged.
  • Checking expire date of existing cert…
  • Valid till Feb 23 18:24:46 2020 GMT Certificate will not expire
    (Longer than 30 days). Skipping renew!

The http: config is like this:

http:
base_url: https://my.duckdns.org:8123
ssl_certificate: /ssl/fullchain.pem
ssl_key: /ssl/privkey.pem

I can’t figure out why the expiry date between the cert served up in the browser and the one in the logs of the DuckDNS add-on are different. I can provide any other info if necessary.