I have completed the 4 weekly challenges on my warlock (and two on my hunter), but am stuck at 3/4 challenges completed for the rank boost.
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Just here to say I have the same problem. I’ve completed 3 challenges on my Warlock, then all 4 on my Hunter and finally returned to Warlock for the 4th challenge. It still gives me bonus for 3 challenges only, even after the daily reset.