1 CMYK value change and keep the rest the same

[PATRICK31015144xd8d]

Good day to you,

I have multiple element with CMYK VALUES EX. (10-20-0-30) - (10-20-0-40) (10-20-0-50)

on the previous version of illustrator I would be able to select all three elements and change the value of the yellow and only the yellow value would change. But with the current Adobe illustrator I am tring to do the same but when I change the yellow value the black changes as well. Is there a setting or something that I can do to keep the values on 3 colors and only changing 1 with out changing all the rest??

I have put a smilliar example in the attachements 

[Monika Gause]

In my version of Illustrator this works.