@CHILDISH_K1LL3R There are a few things you could try.
Clear the cache in ~/Library/Caches/com.spotify.* and log out and back in, see if that rectifies the problem. You can see what the config is set to for auto log by running the following command. If all else fails just nuke the "~/Library/Application Support/Spotify" directory.
cat "~/Library/Application Support/Spotify/prefs"
There should be a line that says app.autostart-configured=<true/false> which should be changing when you set the preference from within the Spotify app.