How come this singer switches back and forth from Mandarin to x?

To my impression, the singer is pronouncing some characters in Mandarin and others not so much. This could be a regional accent, but just found strange. Curious to know what regional accent it is.

https://www.youtube.com/watch?v=x3bDhtuC5yk&list=RDcD_g8Yb3b4Q&index=8

submitted by /u/tarasmagul
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