Again, and I am not bashing on you, it’s most likely grower error. He has put years into his breeding. Yes there is a chance that you have a wonky bean that’s genetically inferior for whatever reason. But that is a very very remote chance. Literally no one else out of hundreds have had any issues. So why don’t we try and diagnose what’s wrong with your plant. Do you have any pictures?
Almost certainly grower error. Nothing against Purple, but blaming Roc's genetics while admitting that his environment isn't perfect in the other thread isn't a good look.