Hello ctphoto1,
We're glad you thought to ask Apple Support Communities about the issue you're having with sound only working on the right speaker in various apps. If you haven't already, restart your Apple TV and surround sound system to see if fresh connections help: Restart Apple TV
If that doesn't help, see if calibrating does: Use Apple TV to play audio throughout your home
If the behavior continues, we recommend reaching out to the manufacturer of the surround sound system you're using to have them look into this with you too.
Thanks, and take care.