Nameserver works only for .eu domain at registrar's panel?

This is getting really frustrating,

my registrar is using ODIN for domain administration, as to myself I'm using webmin with BIND DNS.

My nameservers are:

ns1.ekspograf.pl ns2.ekspograf.pl

So it seems that on my registrar's panel .eu domain delegation to my nameservers works perfectly but when I want to delegate .pl domain then I'm getting Update of name servers for domain sampledomain.pl failed: The parameter value out of range.

I've been debugging it for days now and I have no idea what is going on.