IMP, best hand South
E/W do not know the "best hand South" bit, but on the bidding it comes as no surprise.
Not a major bug, I guess (if a bug at all?).
I just found it mildly curious that West decided that he was not worth a Michaels overcall over 1S (a decision with which I happen to agree), and yet despite both opponents bidding on a hand which so far rates to be a misfit, he thinks that committing to the 3 level vulnerable opposite a silent partner, vulnerable at IMPs when opps have settled in a partscore, rates to be a long term winning action.
Well it worked here (partly aided by N/S it has to be said). Does that make it winning Bridge? Dunno, myself.

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ing) tr. v. - Any bid made by bridge player with which partner disagrees.