Windfury Bug on my server... help a dude out :3

[cyianos]

Windfury Weapon

Links:
- Windfury Weapon - Spell - World of Warcraft
- Windfury Weapon - Spell - World of Warcraft


How it should work:
- Imbue the Shaman's weapon with wind. Each hit has a 20% chance of dealing additional damage equal to two extra attacks with 1250 extra attack power. Lasts 30 minutes.
- After WF procs it cannot proc again for 3 seconds. This means that WF will proc less than the 20% promised on its tooltip.
- MainHand+Windfury Weapon enchant should deal:

(<(Min Weapon Damage+Max Weapon Damage)/2>+(AP+WFAP+<Totem of the Astral Winds>)/14*<Weapon Speed>)*110%*140%

- OffHand+Windfury Weapon enchant should deal:

((<(Min Weapon Damage+Max Weapon Damage)/2>+AP/14*<Weapon Speed>)/2+(WFAP+<Totem of the Astral Winds>)/14*<Weapon Speed>))*110%*140%

How is it working:
- shaman can enchant Windfury Weapon to others but he should not.
- chance to proc for Windfury Weapon is too high and it can proc twice on 1 autoattack here but it shouldn't. Even if it had 1 proc chance on 1 autoattack - 2 procs in 1 second isn't normal.
- seems that Windfury Weapon proc always crit (but not sure).

Where exactly can i find this error, and how would i fix it?

Any help would be greatly appreciated.