Border appears around icons
My phone functions normally, but there is a strange issue regarding the act of selecting apps, typing, swiping, etc. The touch response is acting very strangely because whenever I touch an app or anything, a border forms around the icon that I touch, and the only way to open the app or funtion is to do a double-tap. To select another app or function, I must first select the app to get the border placed around it, and then I must double-tap it again. This makes the whole process very cumbersome and irritating. Does anyone know what is going on?
iPhone 3GS, iOS 5.1