The website is swiftimpulse.com.au.
Complete feed https://swiftimpulse.com.au/feed/podcast
Podcast page https://swiftimpulse.com.au/podcast
I tried adding ‘September 28 2017’ a couple of times. Both times all other elements from other plugins worked (Tweet gets sent out, Facebook gets updated) but for SSP the podcast didn’t appear in either the latest episode list or the recent podcasts list. It appears in the ‘All Episodes’ section in the Dashboard, is directly available here (https://swiftimpulse.com.au/podcast/september-28-2017/) but doesn’t appear in the feed, the series list, recent episodes, latest episode or as an entry in the stats area of Seriously Simple Stats.
I have since added ‘October 05 2017’ and this has gone on the website correctly and as expected, with all the usual areas being updated, so the behaviour seems to have subsided for now. I’ve just updated to the latest version of SSP too (today – October 10).