Apparently, the wrecking ball buff (increases the damage of whirlwind) isn't removed till the END of the animation. This of course causes Ovale to think the buff is still active and thus often suggest using Whirlwind again when in reality it won't be up.

An example of the timing SPELL_CAST_SUCCESS for Whirlwind fired at 31.871 and SPELL_AURA_REMOVED FIRED AT 32.657. A difference of ~3/4 a second, probably the length of the animation.

Not entirely sure of the best way to fix it. I got a couple thoughts but maybe you can come up with something better.

#41 fixes this. Not sure if it's the best way to do it but seems functional.