I can reproduce this on more than one Apple Silicon Mac that I have available. MacBook Pro 14″, MacBook Air M1, etc. All are running the latest MacOS (12.1)
if I had to guess, the bug would be in the PAR decoder section.
Just to make it more interesting.. there is the same bug on NZBVORTEX. so presumably, the bug might be in a PAR library that both apps are using.