Wowza does not have a composite feature for players, it would need to be done first through the encoder as far as both streams on same webpage. Then Wowza can ingest the stream from OBS for example in one screen, but you’d need to do that first on your end before sending the stream to wowza.
We do have a composite feature for WebRTC, but that’s completely different from what you’re asking I believe, but you didn’t share the protocols or the player you are using.
You may need to check the documentation for the encoder or the player to see why the streams are mismatched. Also check Stack Overflow as they’ve discussed composite streaming and multiple players in one screen.
If this is for Wowza Player and you have a license previous to the sunset of that player on 4/20, then you can submit a support ticket and we’ll take a look.