Brainfreeze Proc lag

I have been noticing that I am gaining a proc of brainfreeze but I don’t gain a charge of Flurry (remains on cooldown). The flurry skill will actually light up as if I gained a proc, but it will remain on cooldown and never gain a charge until the full cooldown. Sometimes I do gain a charge, but it does not occur instantly (Flurry lights up, but the charge is not gained until a 1 or 2 seconds after). Is anyone else experiencing this? Is this intended?

Are you sure your flurry isnt just lighting up because you are getting excess frost? The delayed charge you get could be from you using excess fire at the same time.