Windfury has a lot more bugs than just that. And yes, Rockbiter AP values on many of its' ranks are totally wrong.
The main issue with Windfury is its' inconsistency in how many hits you get from a proc. In rare cases you get ZERO bonus hits from proc'ing Windfury.
Here are a few examples I screenshot yesterday alone (seen a lot more by now, these are just a few examples)Normal Windfury behaviour #1: Normal swing + WF proc = 3 hits total
http://puu.sh/gBIIv/718c57c29b.jpgNormal behaviour #2: Normal swing + WF proc + Stormstrike = 4 hits total
http://puu.sh/gBIOd/1beaf554bb.jpgNormal behaviour #3: Normal swing + WF proc + Stormstrike + WF proc = 6 hits total
http://puu.sh/gCvMI/0b551ba9fa.jpgWRONG behaviour #1: Stormstrike + WF proc = 1 hit total (WF proc never granted any bonus attacks)
http://puu.sh/gBHVU/7f72460768.jpgWRONG behaviour #2: Normal hit + Stormstrike + WF proc = 2 hits total (again no extra attacks on the WF proc on the Stormstrike)
http://puu.sh/gBIDm/bead4f2781.jpgWRONG behaviour #3: Normal hit + Stormstrike + WF proc = 3 hits (This one made no sense at all, I hit him with an auto + Stormstrike, and WF proc'd, but only got 3 hits total, but there should be 4 hits total)
http://puu.sh/gBJLL/cc7c771d68.jpgBoth normal auto attack WF proc and Stormstrike WF proc can have this wrong behaviour occur. I'd say it happens in about 5-7% of WF procs. Most of the times it's 0 bonus hits on WF proc when it happens, and you can tell very obviously when it happens.
The combat log will not register any extra hits, be it missed hit, parried, dodged, blocked, etc - literally no attack occurs at all sometimes when WF procs.
And in extra weird cases, sometimes you get maybe 1 bonus attack instead of 2, again, no clue as to what's happening there.
One time I hit with auto + SS and a WF proc happened. I ended up with 5 hits. Yeah, that's impossible. Do the math, how can I hit 5 times? (No, I don't have HoJ trinket yet)
Normal + SS + WF = 4 hits
Normal + WF + SS + WF = 6 hits
5 hits should be impossible.
Windfury is indeed very bugged and I don't know what is going on or why. Never seen this issue before on privates.
BONUS BUG EDIT: Also, you can proc Windfury Totem even when you have Windfury Weapon on. I've seen it happen at least once to me, WF proc'd and I got 1 extra hit and I saw the text <Windfury Totem> buff appear for me.
