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Have never bothered to tear apart the formula by which UZR estimates a defensive run value, but your question is perplexing.
Per the eye, Ichiro has been good at minimum in RF. Remember, local fans compare Ichiro to his own previous years, but UZR (and all defensive stats) are comparing him to Nick Swisher, Nick Markakis, Jay Bruce, Jeff Francoeur and Jayson Werth.
There just isn't a way in the world that you pick up sides and prefer Nick Swisher out in RF to Ichiro out in RF. But right now UZR says that Swisher's glove has been 11 runs better than Ichiro's already.