No CAA record on nazwa.pl (wildcard=false) contains the issuance domain "letsencrypt.org". You must either add an additional record to include "letsencrypt.org" or remove every existing CAA record. A list of the CAA records are provided in the details.
nazwa.pl. 0 IN CAA 0 issue "certum.pl"
CAA records control authorization for certificate authorities to issue certificates for a domain
nazwa.pl. 0 IN CAA 0 issue "certum.pl"
A and AAAA records found for this domain
nazwa.pl. 0 IN A 77.55.124.100
The IANA public suffix is the TLD of the Registered Domain
The TLD for nazwa.pl is: pl
1 Certificates contributing to rate limits for this domain
Serial: 283319841850579725175168746080778720890884
NotBefore: 2018-11-27 12:32:10 +0000 UTC
Names: [bobkarotkaoy.nazwa.pl]
The current status.io status for Let's Encrypt
Operational