Leather horse armor turns white after dyeing

I was in creative, trying to test different colors of horse armor, but after I dyed it, I put it on a horse, and the horse armor was white. My friends joined, and they tried too. One of my friends could see the color while my other friend couldn’t, like me. I don’t know what type of iPad they had, but my friend who could see had an iPad mini, and my friend who couldn’t, had a big screen iPad like me. I even tried normal leather armor, but it was also white.