Hey BunnyHall,
We're grateful that you posted here so we can help you figure this out.
You mentioned that this is happening with the Rumble app on your iPhone and iPad. Does it also happen when you listen to podcasts using the built-in Podcasts app on your devices? The reason we ask is that we'd like to try and isolate the issue which can help guide our troubleshooting more effectively. To test, you can listen to the same podcast using the Podcasts app or, if that one isn't available, you can test with a different podcast that appears on both apps.
If the issue is only happening when you use Rumble, we would recommend working with them directly to get a better idea of how you can best resolve this issue with their app. You can use the information here to reach out to them: How to contact an app developer - Apple Support
Thank you for being a part of the community here. We hope this information helps!
Best wishes.