Missing podcast Episodes

Looking at the feed, there are twenty episodes there, including episode 18 poster today. All these episodes also appear when subscribing manually in iTunes.

You have not given the iTunes Store URL for your podcast. Searching on its title produces no result, suggesting that if it was in the Store in the first place it has been removed (if this is the case you should have received an email telling you it has been removed, though usually not why).

Removal seems highly likely as from the look of the feed your podcast consists of 'mixes' from commercially issued recordings: this is a breach of copyright and also against the Terms of Use for podcasting; podcasts which do this get removed once detected.

The feed you originally quoted,

http://feeds2.feedburner.com/netmixglobalhousesessions

is the same as the feed you quote above,

http://netmix.com/category/podcast/netmix-global-house-sessions/feed/

and its title is 'Netmix Global House Sessions Podcast' - when I searched on that there was no such podcast in the Store. These feeds both contain the 'itunes:new-feed-url' tag redirecting to the netmix.com feed - in effect itself.

However the Store page at the URL you give above leads to a podcast page called 'Netmix. com' which is using the feed at

https://feeds.feedburner.com/netmix

This has only one episode with playable media, episode 18; the remaining episodes have no playable media and so are ignored by iTunes. This feed does not have the 'iTunes declaration' in the top of the feed so no 'itunes:...' tags will work. I can't tell what is the original feed submitted to Feedburner to produce this feed, but you need to replace that with a copy of the netmix.com feed I link to above, so that the Store and iTunes will then be redirected to that feed. After a couple of weeks you should change the 'itunes:new-feed-url' tag to point to the first Feedburner feed I quote (assuming you want to use the Feedburner version). Either that or copy all the episodes from the original feed into this feed, but you will need also to make sure it contains the iTunes declaration:

<rss xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" version="2.0">

Doing what you describe should work. Check it by subscribing manually - you should see the correct episodes immediately. However the Store will probably take a couple of days or so to catch up.