ALL podcast episodes added to queue even after unsubscribing

There seems to be a bug with some podcasts. There are two that add every single episode to my queue. I unsubscribed the first time this happened and that stopped it (although it’s annoying that I now can’t follow a podcast I liked). This second time I unsubscribed and it’s still happening! I’ll clear the queue and then the next time I open the app it’s filled again with even older episodes. For a podcast that’s been running for years this will take me forever. What can I do to stop this from happening? It’s driving me crazy. (In case it helps, the podcast is The Intelligence by the Economist.)