Cooldown reduction affix bugged?

On my seasonal druid I have an offhand totem with 2 separate cooldown reduction affixes. both of them maxed out at 10.3 which means that item should have 20.6 cooldown reduction. When that is my only item with cooldown reduction equipped, the materials and stats tab shows I have 19.6 cooldown reduction, aka missing 1%

I have an amulet that further adds 8.9% cooldown reduction which should bring my total up to 29.5% with both items equipped. When I again check materials and stats, with both items equipped that tab shows my cooldown reduction at 26.7% so now I’m missing 2.8% cooldown reduction. is there a reason for this that im unaware of or is this a bug?

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@Blizzard, I also am having the same issue. I have 10% on helm, 10% on amulet, should be 20% Cooldown reduction, but I am only getting 19%.

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Okay, I am experiencing the same issue as well on Sorc. The CDR is not calculated additively as it was originally but on a ā€˜curve’ with additional bonuses becoming less effective similar to how resistance stacks.

I have close to max CDR% on items. 10% on helm, 10.3% on Pendant, 10.3*2% on Focus which should equate to 40.9%. But it is currently at 35.1% which is reflected accordingly on my skills cooldown.
Hmm… unless this is intentional in preparation for Season of Blood?

I am bumping this thread.

I don’t know the answers and would like to know whats going on with the cooldown reduction % as well. As discussed above, it is believed that cooldown reduction works on a curve like resistence. I have 18.3% cd from my totem (10.3% cd Inherent affix and another 8.0% cd from enhancement and gear upgrades on the regular affix, but on my stats it says 17.5% and we know something is causing this. But I have an even weirder discovery. The totem I am wearing says 8.0% right? However, the totems I have unequip (in my stash) when using ā€œAdvanced Tooltip Comparedā€ on, I have a totem thats 7.4% cooldown reduction but it says it is actually HIGHER than the totem I am using at 8.0% cd BY +0.2% cd in Highlighted Green Text. Something is telling me the advanced tooltip and main stats sheet of cooldown reduction is not telling the reason that it works in a different way. Mine is fluctuating because just say when I equip the other 7.4% cd reduction totem and when I look at the better 8.0% cd reduction, the Highlighted Green Text now says +1.4 cd reduction when it should be just +0.6% cd reduction.

Thanks.

This is not a bug, and has been explained countless times before, including on the D3 forums since reductions of any type have always worked this way.

Reductions are multiplicative, not additive.