Good Morning Samuel,
I did a test submission of your feed in iTunes by going to File > Subscribe to Podcast and entering the URL to your feed there. When I tried that yesterday, I received an invalid feed error, but this morning it pulls up your feed just fine. I ran it through Apple’s recommended validator and it passed there as well.
You might try altering the URL slug of your feed a bit and resubmit with the new URL. You can do that by editing your page and changing the slug just below the page title. Perhaps they have the feed cached and they are pulling in old information. A slightly different URL would be a way around that.
If Apple is still rejecting your feed today, then I believe you’ll need to contact them and get a reason why. Those are the two tests that Apple gives us to use prior to submission. Since it passes both we’ll need some indication from them as to why it is being rejected.
Let me know what you turn up,
Bill