Help with broken UI on export

I’m having a big issue with the UI, on all Android devices/PC export the UI is normal. But when exporting the game to IOS and installing it onto the iPhone 6 using Xcode, the UI is broken across the whole game.

Any help into fixing this issue would be appreciated, Thank you!

Below is a screen shot of the UI working when on Android and when the game has been installed not working on iPhone 6:

The best way to fix this issue is to assign a small 1x1 square sprite to UI buttons, panels and other basic ui elements which do not have a sprite already assigned.
This was solved by @troien