On my server, all my domains use external DNS addresses. As in the DNS test of the piekielko.com domain:
https://www.dnsinspect.com/piekielko.com
fns1.42.pl. → 79.98.145.34
fns2.42.pl. → 51.38.99.90
ns2.afraid.org. → 69.65.50.223
sdns2.ovh.net. → 213.251.188.141
However, I'm having trouble...