Yes that is common with the English Orps, though not desirable. It is nearly impossible to not get any feathering at all on some imported lines. It is believed (and I have read) that to create some of the colors they were crossed with Cochins in England generations ago. And it will still show up from time to time. It is best not to use the ones with feathers and with each generation you will see fewer and fewer until only on a rare occasion will any be visible. Another through back from generations past.
With limited breeding genetics sometimes it is not always possible, but best to try to avoid it, although they have been shown with some slight feathering. Yellow skin though is a disqualification, not just a fault.
I think yellow skin is harder to breed out of than leg feathering..........