The same thing happens to me!!! I only get black and greyscale tattoos. The grey tends to be okay, but pure black always falls out so bad on my skin. Every tattoo I’ve ever gotten, I have to go back and get it tattooed over a second time for it to stick. Glad to know I’m not the only one!!! It’s literally like my skin rejects the tattoo the first time. Luckily, my tattoo artist knows I have this problem and always goes over the second time free!(: