Why does my haircolor turn red??

My natural hair color had no red in it either (a light, golden brown). But when my hair is colored, even if the color has no red in it, my hair turns red. I have no idea why this happens. I just had my natural color dyed, (I said only one shade darker, with no red tones), and its red. Now I have to go back and hopefully get it fixed. This happened to me once before, except I was the one that dyed my hair. My hair stylist got the red out successfully by using a heavy foil highlight on my hair, and then used a toner over it, which turned it a light golden brown close to my natural color. Perhaps this would work for you. I would also like to know why my hair always turns red. Hope it helps to know your not the only one with this problem.