Photoshop color picker question

i have question. first of all, these color settings:

rgb default working space: srgb
cmyk default working space: coated fogra39 (iso 12647-2:2004)

 

i don't understand why happens:

if create new rgb (srgb) document, , in color picker choose c: 33%, m: 33%, y:33%, k:0%. why when pick color eyedropper tool (or see via information window), appears c: 28%, m: 30%, y: 30%, k: 7%? happens there?

doesn't answer lie cmyk working space chosen? (fogra39 different from, say, u.s. web coated (swop) v2.) don't know sure i'm not propellerhead on matter.

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