just button edge works! (with video)

I dont know why but just my buttons edge works, I tried a lot of things but nothing fixed it, in this video "easy button" have this problem and the "normal button" too,but "hard" button not, if I change their position in canvas it works, but the button that replace at the top will have the same problem, just a Image is back the button, nothing more (sorry for my bad english)

in this video im clicking all time: