Audio is delayed in OBS

OBS specific issues

Might be caused by a Browser-source related bug in OBS; this is normally the cause

Fully restart OBS and see if that clears the issue. Start OBS in administrator mode, if on Windows, to ensure it's not being throttled. Some users have had better luck fully uninstalling OBS and then re-installing it. If that fails, you can try to bring in audio via https://vdo.ninja/electron instead. &novideo can be used to ingest just the audio. Route the audio to a virtual audio device and then bring that into OBS as an audio device. Should be in sync this way.

Other possible options

VDO.Ninja uses 48000-hz sample rate for audio; using this sample rate whenever possible can help keep things in sync.

Try to avoid overloading your CPU or using too many browser source elements in OBS; OBS Browser Source can get overwhelmed.

VMix could be an alternative to OBS if problems persist; Vmix supports VDO.Ninja also.