Matti is right and the immediate problem is with your certificate. If you enter "
cigarcraig.com" at
https://www.digicert.com/help/ (one of the links Matti provided) it will show you what's wrong.
More concretely, it seems like you're missing an intermediate Let's Encrypt certificate. The reason the site still works in the browser is that Let's Encrypt is so common that browsers usually have intermediate certificates cached, but you cannot rely on that.
I can speculate a bit more about the root cause of the problem: your site is using Let's Encrypt. Let's Encrypt generates three output files:
cert.pem (containing the server certificate),
chain.pem (containing the Let's Encrypt intermediate certificates),
fullchain.pem (containing both). It looks like the server is serving
cert.pem but it needs to serve
fullchain.pem. So it's a simple configuration error on the server. If the above is all Greek to you, please show this thread to whoever configured SSL for you, and they should be able to fix it.
- Maks.