So I wanted to find more proof of this and it was a pain in the ass but look at this http://www.handprint.com/HP/WCL/color5.html Mainly the section called "Visual Color Can't Predict Material Mixture" also this could possibly be a case of Partitive Mixing as opposed to additive or subtractive.
It's a very tricky mixture of alcohols that you then actually blend in a blender, then pour out. The recipes for it are all over the internet, but making it takes a lot of practice apparently.
Via You Tube: "Take a shaker tin and fill it 3/4 with ice. Add Malibu, Vodka, and Triple Sec first. Tilt the tin and add Grenadine. Then add OJ and Sweet and Sour. Finally topping it off with Blue Curacao. Do not shake. Watch the colors layer as you pour."
It seems like very carefully pouring out a Pousse-café (I only know what that is because it's mentioned in a Kurt Vonnegut book) so the quoted comment above seems reasonable.