Something not right with the vocals
Often, a song becomes stuck. Sometimes it is the arrangement. The song is boring, slow, or repetitive, or a hook is missing. Sometimes it is the mix. Perhaps the bottom end is hollow and unexciting. There is too much in the middle. Perhaps the mix is just a flat nothing going nowhere. Sometimes it is the song itself. Maybe the lyrics are corny. Or the melody has so much pop and march that it belongs only in a movie soundtrack – probably only in a western.