Macbook pro retina blurry on top bar menu

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http://superuser.com – Here is a screen shot of my top menu bar. As you notice, bluetooth icon, wirelss icon, speaker icon, international A, battery percentage, battery icon, date and magnifier are blurry but not notification icon. Does this supposed to be happened? Or Apple did not update their icons to better resolution, I have no clue. (HowTos)