Cooldown reduction Broken?

My current CDR values

13.6 (helm)
19.6 (amulet)
11.7 (ring)
18.4 (focus)
7.0 (Implicit on focus)

Total should reflect 70.3 total CDR, instead my tooltip is showing 53.5

Curious to know if anyone else is having this same issue.

math checks out to me. each stat is multiplicative not additive. take the base cooldown of say 10secs for example.

reduce it by 13.6%. you then reduce the result by the next amount. so on and so forth. the end result equals the overall 53.5% reduction. this is correct

Well shoot I have 1,700 hrs played and never knew that, thanks for the explanation.

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nearly every stat in the game acts like this. resource cost reduction, but most importantly is max life% increases. if you grab +2% max life nodes on your paragon board each adds life based on current max. makes it very easy to get 50k life on nearly any char if you look for those.

Yeah for some reason I just assumed it was additive, should have know better tbh lol. Feel like they could do a better job explaining these things in game but what do I know.