Most of the indicators come from the fairly ubiquitous open source library TA-Lib. Really, either an indicator is correct or incorrect ("a bug"). The staff is usually pretty quick to fix bugs.

Personally, I've never heard of Jurik. Also, a search of this forum reveals that nobody here has ever used the word "Jurik" (until now).

Anyways, you can always write your own indicator, as detailed in the workshop:
https://zorro-trader.com/manual/en/tutorial_lowpass.htm