Stench from Persil Bio liquid

Not sure if men are supposed to use this site but here goes! I came across an old thread while searching for anyone who is as dissatisfied with Persil Bio liquid as we are. We've used Persil for decades but noticed this unpleasant smell in the last year or two. At first I thought it was down to my sweaty cycling kit but this afternoon we washed some sheets that our grandchildren had used on a visit last week. No soiling of any kind and a straightforward 40 wash but the stench when I opened the machine was nasty. I rewashed them in some old non-bio powder we had under the sink and the smell has gone. Earlier posts were too diplomatic, referring to the new "fragrance". This is a stench. Yet another example of change for change's sake leading to an inferior product?