unity 2017 UI Delay bug

so basically i have go 2 buttons, one Left other Right, whats happening is that then i press my finger on the edge of the texture it takes like 2 seconds for it to change the color of the button to red which is my "onPressedColor" but if i press the center it changes the color right away, and its not only the color that takes time, the function they are associated to, do not run until the color changes, any clues? there is nothing overlaying it this si how i tested.

I noticed the response was sluggish so i pressed center of the UI textures and the functions run right then i pressed my finger right on the edge of the button and didn't move my finger, it was 2 seconds to recognise the input

Any Clues?

it was working fine one unity 5