All leather horse armour looks white

So I’m making a stable in my world and I decided to make every single type of horse armour and put it on a horse. I made each color by dying it with a cauldron and it looked pretty normal in my inventory. I made all the horses that I needed and then I put the armour on them. But when I put the armour on them, it all looked white. Even the not-dyed armour! I’ve tried to copy the world, go out and in, but nothing works! (The colors on the image are in rainbow order from right to left, not that it matters)