Unity 4.6 Controls (Buttons, Triggers, Text) get Distorted once an Add or something above them is shown

I am using Unity 4.6 UI and facebook SDK for unity and creating a custom invite dialog. The problem I am facing is that the custom listview that I have created get a bit distorted once a panel like the facebook invite native dialog or facebook feed native dialog is displayed on it. I mean distorted in a sense that the image get broken and doesn’t shows appropriately. The problem occurs mostly with Full HD Device. I have tested on LG Optimus Pro Is working fine on google Nexus and G’Five. Is this a problem from my side or a server or Unity related issue? Please guide me so I could work accordingly.