I think this might be a DNS problem because from a few places I’m getting an NXDOMAIN for cyberguerilla.org and www.cyberguerilla.org, including from Afilias .org servers. Are you sure your DNS is valid and visible from elsewhere?
The ACME challenge also needs to be on http://cyberguerilla.org/.well-known/acme-challenge/ (not https), but I don’t think that’s likely to be the biggest problem here.
I could not access your www address at tcp/80. Also I noticed that your root A address is different of your www address(both are A records). If both IPs are in the same machine OK, but otherwise you may have problems. Actually what you want is that both www and domain.com go to the same .well-know. But I think you problem is in nginx, I could not get any response at port tcp/80, you have to listen at tcp/80 without SSL.
That’s the load-balance all ips are on same server nginx listen to port 80 (no ssl) and there is no redirect to https only HSTS but result with domains that are not on load-balance is the same.
This is not the first certificate I done see https://cyberguerrilla.info/certificates/cgan-cert-info.php all domains hosted here use letsencrypt.