15 songs that won the Daesang Song Of The Year in the history of ‘MAMA’: Why did TWICE win the award 3 times but have 2 controversial times?

TWICE's victories in 2017 and 2018 are still controversial as in those two years, Kpop had two more popular hits, but they were completely empty-handed at 'MAMA'.
https://kbizoom.com/15-songs-that-won-the-daesang-song-of-the-year-in-the-history-of-mama/