Why is the app using mobile data when my settings are all set to Wi-Fi?
When you're using mobile data, it might be that you have accidentally played a streamed episode. To prevent this from happening, go to Settings > Playback, and enable [Show warning when streaming on 3G/4G]. That way, a warning pop-up will appear before you can proceed playing a streamed episode.
Furthermore, please make sure in Playback Settings if the [When can continuous-play jump to streamed episodes?] option is either set to [Never] or [Only on wi-fi]. You may also go to Settings and enable [Show downloaded only] to only see downloaded episodes in your playlist.
If you're still experiencing the issue despite following the above mentioned tips, feel free to send your logs via Settings > Help > [Contact us] so we can conduct further investigation. A podcast app can potentially use a lot of bandwidth and we care a lot about that. We want to be sure you have it set up according to your own preferences and works as expected. Help us improve this.