Hi,
So I'm not sure if there is an easier way of doing this but, being a little obsessive about having things in the right place, it was driving me mad to see podcasts I'd already listened to in the "Listen now" section of the iOS podcast app.
It's not a perfect solution, but if you go into library, tap on the show that has the offending episode in, move to the list of episodes with voiceover, turn voiceover off and then sweep left a few times, you can remove those pesky podcasts that continue to hang about.
If anyone can tell me a more accessible way, great, but I couldn't seem to find one in the latest IOS podcast app.
O