I put my custom music on the station but it doesn't START with custom music

I put my custom music and they work really well. The point is even though I disabled every sims original songs on the preferences, a Simish song still shows up on my radio! It's Electronic music station and the song isn't even in the list. It always starts with that song everytime when I turn the stereo on so it's pretty annoying. So how do I get rid of this unlisted song and make the radio station start with custom songs?