Double shock on Monk?

Hi everyone! I'm playing a Monk, currently in Act 2. The maximum shock I can apply to an enemy at the moment is 23%. However, when using the "Tempest Flurry" skill, I somehow can apply a 43% shock. Is this a bug, a feature, or is everything working as intended? =) I'm just curious to hear from build theorycrafting enthusiasts about what's causing these extra 20% shock from using "Tempest Flurry"

fourth strike has +100% magnitude of shocks inflicted

Yeah, I really missed that in the skill description at first =) Thanks for the answer!