That was probably at the time when I had a working iPad. It stopped working right along with another iPad we had. Rather than pay several hundred dollars to get them fixed, I went and got 2 androids tablets to replace them for much cheaper and everything showed up fine.
After that I realized there’s something different about the way the Safari browser displays background images on the iPad. I’m not sure if it’s a bug or not.
I’ve even tested this and other themes on a few other tablets and everything showed up as it should. So there’s something hidden on an iPad that’s causing the conflict. I haven’t had access to one in a long time.