Box Collider 2D Not Scaling Correctly On Different Devices

I recently finished my game and it plays great on iPhone 6, but when I tried the iPad, the box colliders I have set up around my canvas remain in the same place and don't scale. In one of my scenes I have a bouncing ball spawning in the collider (so the ball can appear on screen and not bounce off the collider). There are 4 total colliders - top, bottom, right, and left. I have my canvas set to scale with screen size and match at 0.5. I have done lots of research and come up with nothing except UI help. How can I make this work? I have attached some photos below so you can see the issue in action.