When a video is pushed to YouTube via Vidyard, you can set whether it is private, unlisted or public. If the privacy setting is then changed on YouTube after the push or link, Vidyard will overwrite the privacy setting back to what is set in the Vidyard platform.
Vidyard will always be the settings 'master', so it's not advised to change any settings on YouTube once a video is pushed or linked. Use the settings in Vidyard and then resync.