To clarify, do you mean that while broadcasting live, you're seeing the autoDJ's song titles in the recent tracks/now playing widgets provided by Centova Cast? That shouldn't happen if you're using the mount points that Centova Cast recommends (/live for your live broadcast, and /autodj for the autoDJ). Centova Cast automatically checks the /live mountpoint first, and if anything is connected there it'll give that metadata priority.
Make sure your live source *is* sending metadata, though, even if it's just the station name, because if it's left blank Centova Cast will assume no live source is connected and use the autoDJ metadata. (There's no reliable way other than the presence of metadata to detect a source connection on a mount point.)