My actual knowledge fades out at this point, but I'm guessing that if the invaded colony is recently established the smell of nectar and honey may be stronger than the smell of bees, meaning it just appears to the bee to be a big patch of flowers or whatever.
That's just a guess. More likely is that they get messed up in the head by infection or cold (bees really don't like cold) and they lose their navigation abilities. Or in the case of man-made hives, swapping places of hives may confuse them.
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