This would be a very serious issue and I strongly advise that you open a ticket about it. Here's the information we need for troubleshooting this:
Please edit the station's settings, and, under the advanced tab activate the Nextsong Debugging option. This should activate Centova Cast's advanced debugging, which in turn should show us why Centova Cast has chosen the wrong songs.
After this, please restart your station and let us know next time when you think Centova Cast has wrongfully chosen a song. (unfortunately we can't investigate events that happened before the moment when you activated the Nextsong Debug)
We would need to know the exact time when this has happened and the song which was wrongfully played, also your Centova Cast URL, admin password, and the affected account's username.