Using NGUI buttons on my Ipad doesn't work properly?

I am making a simple infinite runner and I made the whole UI using Unitys native NGUI system. The buttons work properly when playing in the unity editor or using unity remote 4 on my ipad but when I build and run to my ipad and play from there natively I find that I need to press the button a high number of times in rapid succession just to get it to work.

Gameplay is unaffected, I can still play with my character just fine but there seems to be something wrong with ALL the NGUI buttons. I'd have to hit them at least 10 times in 1-2 seconds just for it to register. Is there any reason why?

UPDATE: Ok it looks like I figured a new interesting event. If I tap really hard and really fast on my ipad the button will function 90% of the time, maybe 100% if I tap it with enough force.

If I lightly tap it regardless of speed it will NEVER function. Is there a way to see how the NGUI buttons operate button presses?