Several questions with this scenario.
First a color shift from 4650 to 4000°K would produce a yellow cast, not blue.
Second, an X3200 at 1/2 power produces about 5450°K unless it has the old "color corrected" tubes, which might drop it to 5100°K. At a given power setting they simply don't vary in color temperature . . . 30° perhaps from very cold to very hot. For them to output 4650 at 1/2 power I would suspect a rather yellowed (smoke, etc) softbox, a non neutral shooting area or an inaccurate neutral grey test card (most are off by several hundred degrees from patch to patch, as are most cameras from one exposure level to another). (Color meters - even at $1300, are even worse from one exposure level to another).
Since the change occurred after a wardrobe change I would suspect a change of color in the shooting environment - different background color or even the color of the clothing.
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