New Podcast Feed: My episodes are displaying in the wrong order

I can't help you unless you post the URLs of both your Apple Podcasts page and you feed.

Something odd is going on: your Apple Podcasts URL doesn't work and searching for the show by title brings up no relevant result. Subscribing manually shows the image but claims that I have 'caught up' and shows no episodes.

I need to have a closer look at the feed but i'm afraid I don't have time right now: I'll try to do so later today.

I still can't get the URL to work (this is Podcasts on Catalina) - it opens the Podcasts app but displays only a selection of podcasts, not yours. Searching by title doesn't work. Attempting to subscribe by the feed URL shows no episodes.

There are some errors in the feed which may be relevant.

The podcasts is tagged as 'Serial'. Apple say:

'Specify serial when episodes are intended to be consumed in sequential order. Apple Podcasts will present the oldest episodes first and display the episode numbers (required) of each episode. If organized into seasons, the newest season will be presented first and <itunes:episode> numbers must be given for each episode'

You do not have 'itunes:episode' tags.

Each episode has an 'itunes:title' tag but not a 'title' tag. You do not have 'itunes:subtitle' or 'itunes:summary' tags. ('Summary' is not an acceptable tag: Podcasts should use the 'description' tag).

Date: this may be an issue. Your pubDates tags are formatted as here:

Sun, 08 Aug 2021 00:00:00 +0100 GMT

It can't be both +0100 and GMT (they are contradictory) - it's one or the other. It's possible that this is invalidating the tags and causing the app to invent its own running order in the absence of the 'itunes:episode' tags. See https://validator.w3.org/feed/docs/error/InvalidRFC2822Date.html

Information on tags here: https://help.apple.com/itc/podcasts_connect/#/itcb54353390

As I can't look at the behaviour on Podcasts app for reasons I can't explain this is all I can offer as advice.