HISTORY OF THE ANCIENT UNITAS FRATRUM (1457-1722) The Bohemian Brethren are a link in a chain of sects beginning with Wyclif (1324-84) and coming down to the present day. The ideas of the Englishman found favour with Hus, and Bohemia proved a better soil for their growth than England. Both Wyclif and Hus were moved by a sincere desire to reform the Church of their times; both failed and, without intending it, became the fathers of new heretical bodies - the Lollards and the Hussites. The former were persecuted out of existence in England by Catholic rulers; the latter prospered in Bohemia, thanks to royal and national support. The burning of John Hus at the stake for his stubborn adherence to the condemed doctrines of Wyclif (at Constance, 6 July, 1415) was considered an insult to the faith of the Bohemian nation, which, since its first conversion to Christianity, had never swerved from the truth. The University of Prague came boldly forward to vindicate the man and his doctrines; the party which hitherto had worked at reforming the Church from within now rejected the Church's authority and became the Hussite sect...
“I’m curious, what is the source contradicting Moravians’ own claim of having origins in the Orthodox?”
First, produce an actual claim from the Moravians that they were never Catholic but were instead Eastern Orthodox. Until you do that I have no reason to believe you can validly claim that they claim that.
“The Catholic Encyclopedia doesn’t contradict them as you have:”
I think you need to read the sources you quote more closely:
“HISTORY OF THE ANCIENT UNITAS FRATRUM (1457-1722)...”
Thus, we see already that the old Catholic Encyclopedia is clearly referencing a group that could only be Catholic if it started in Bohemia in 1457.
“The Bohemian Brethren are a link in a chain of sects beginning with Wyclif (1324-84) and coming down to the present day.”
Wyclif - a Catholic who embraced heresy. Not Eastern Orthodoxy.
“The ideas of the Englishman found favour with Hus, and Bohemia proved a better soil for their growth than England.”
Hus - a Catholic who embraced heresy. Not Eastern Orthodoxy.
Produce a source from the Moravians themselves, preferably from an official Moravian source.