I can only dye my minecraft banner 7 times?

So since the banners came out I wanted to make some cool complex designs that I saw online. But whenever I try to make them I can't get past step 7. It seems to work fine for everyone else so I don't get why I can't do it. It's like I can't dye the banner more than 7 times. I really want to make the cool designs but I can't! Why is this happening? (I don't have any mods running and i'm using minecraft 1.8.7)