same thing happened to me
Weird best move glitch
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Yes its glitches
Sorry about this! We are preparing to deploy a fix 
I was playing a blitz game recently and after game reviewing it it showed me on move 30, the move I played was excellent. Then under that it said "is best."
Correct me if i'm wrong but I don't think that means "Rad2 is a good move which can be considered as an excellent move or the best."
Also if you look next to my king it shows Kf8, so I think this is a glitch since Rad2 and Kf8 seem to both be good moves.
Link to game: https://www.chess.com/game/live/47711431943