Generic Color Palate
I am using the newest version of Illustrator. Within the last week or so, my generic CMYK color palette has changed. The percentages that make up the color are different on nearly every color. My black color swatch used to be 100% black. Now it is C:74.97 M:67.92 Y:67.05 K:90.15. Everything in my document is set to CMYK. I changed nothing. My yellow is C:6.18 Y:96.55. It used to be 100% yellow. All of the colors have this issue. Please let me know how I can get this back to the normal way. I've been using Illustrator for the last 23 years and have never experienced anything like this.
Solomon Grundy commented
I don't know if this helps. But I was having the exact same problem with a specific logo I was working on. I think the source of the problem came originally from a piece of work that was made in Corel. Elements of that corel file lingered or leftover in some fashion in the other files associated with that particular company's files. I found when I opened a new document, my colors would be fine. For that particular document I went into each swatch and corrected the color.
To make sure it wouldn't happen again I opened a new document, checked to make sure the swatches were correct and saved the default swatch library to call up when I need it. I also have a personal swatch library that I keep on persistent with all the standard default colors saved.