I agree with BigBill. I think a lot of plants in the Hibiscus family will sometimes have that yellow splotch thing going on. I sometimes see it with my Malvaviscus & it isn't gorgeous, but it just goes away after a few weeks.
It may just be a sign of stress, which is a normal reaction if there's weird weather or some other stressor. In your case the plant is fairly new to your garden, and that's a stressor, especially if you repotted it. Give it some time, and it should be fine.
If it doesn't recover soon, you might want to check that it's getting enough but not too much water or sun or food or whatever, but I'd wait a bit before worrying.