The main thing I would like for you to do is start from a clean slate. Uninstall & reinstall the app. Then only add HEOS/ DENON to the app. Then go to the Settings page & confirm that there is only 1 HEOS source listed. Again, you should never see more than 1 HEOS source on the Settings page. That source can have as many device objects as it wants. You just should never have more than 1 HEOS Source.
And don’t add eWeLink, IP Cameras, or anything else. I’d like to keep this as isolated as possible.