I know 3 .pl domains that doing this so far. This is the registrar
REGISTRAR:
nazwa.pl sp. z o.o.
ul. Cystersów 20A
31-553 Kraków
Polska/Poland
But in fairness, they are smart. They linked all the content of a site so all the info of a site are scraped in. If you search your domain name and some important keywords, this .pl domain is on the first page and even on top.
So your site dropped on ranking. My advise is, if you have time try to investigate more about you domain and your keywords, may this .pl domain owned your site.
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