Mnet's 'M Countdown' made an error with score calculations. 

On the May 16 episode, Oh My Girl with "The Fifth Season" and NU'EST with "BET BET" were nominated for 1st place. The boy group with a score of 7,668 was announced the winner of the week. However, following the broadcast, fans pointed out that Oh My Girl's social media score was miscalculated. 

After validation, 'M Countdown' announced there was indeed an error and Oh My Girl is the actual winner of the week. 

The producers stated, "We have confirmed an error in the process of entering social media scores. We have recalculated the chart and the ranking for the third week of May has been corrected. The winner on May 16, 2019, (episode 619) is Oh My Girl."

'M Countdown' apologized to the fans, NU'EST, and Oh My Girl for the mistake and said, "We will be more cautious with chart calculations to prevent such incidents from occurring again."

The corrected chart shows Oh My Girl received 2,000 points - not 1,800 - in the social media category, adding up to a final score of 8,117.