If your podcast is listed twice in Apple Podcasts or another podcast directory, STOP! Don't do anything about it until you read or listen to this!
/fixduplicates
And if you want to avoid this problem, do not resubmit your podcast if it's already listed!
How duplicate podcast listings happen
There are two common reasons you might end up with a duplicate listing of your podcast, either by your own actions or by automation.
Reason 1: a secondary feed was automatically discovered and indexed
You might have used several different podcast-publishing tools, like your own website, PowerPress, multiple podcast-hosting providers, and such. Or you might have used some automation tools for crossposting, like Spreaker, AudioBoom, Podpage, and such. Or you used a feed proxy to mirror and rehost your RSS feed, like Feedburner or Podcast Mirror.
Any of these tools might have created another RSS feed for your podcast and may even be actively updating it. They could even be serving the exact same feed from multiple URLs, like HTTP and HTTPS (although not so common anymore), or from different subdomains.
Podcast Index, Google Podcasts (rest in peace), and maybe a couple of other systems search the web looking for podcast feeds to include and they'll often find those duplicates. Podcast Index has a fairly smart deduplication process, but Google Podcasts was a little annoying, often switching to the newly discovered feed (even if was only a redirect!) and requiring you to verify ownership of that new feed before you can switch back to your desired feed.
A couple of my own podcasts have had as many as 8 different RSS feeds discovered by Google Podcasts! And even though some of them were proper 301 redirects, the automated system still wanted to change to them instead of the feeds I had intentionally submitted for Google Podcasts to use. But at least that didn't create duplicates and it didn't interfere with my audience.
But other discovery systems might add the extra feeds as new podcasts, resulting in duplicates. (At this time, none of the most popular podcast apps use automatic discovery to build their catalogs.)
Reason 2: the podcast was resubmitted
Do not resubmit your podcast if it's already listed!
I see this problem happen far more frequently lately. When podcasters switch podcast-hosting providers, like from Spotify for Podcasters (formerly known as Anchor) to a provider such as
