Even Childish Gambino staff say they are not sure about Grammy Night.
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Gambino won four trophies on Sunday, but the rapper, whose real name is Donald Glover, did not participate.
"This Is America" won record and song of the year, two of the top three categories.
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Co-Producer Ludwig Goransson says he tried to call Gambino after the show, but it did not go on. He says he would try again.
Riley Mackin, an engineer-mixer of the song, said he last saw Gambino when they worked in the studio a few days ago.
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"He went out and I have not seen him since," said producer Riley Mackin.
Asked if Gambino's absence was strange, Mackin said, "Everything Donald does is a bit strange."