I recommend searching this forum
1. Realize that there isn't native M1 support yet (due to other required software not being available for OBS to leverage) upon M1s release. Last note I saw was the intent is for OBS v28 will have native M1 support. OBS will still run, but in emulation mode.
Was this an upgrade? ie move setting over from old MacBook? or fresh OS and fresh OBS install? Did you change some OBS settings after initial install?