Problem with bumper buttons on Xbox One wireless Controller?

I bought a new Xbox One wireless controller from here. The problem is that when I press either of bumper buttons I feel (little but observable) outward pressure on other bumper, as if they are internally connected. As this is the first time I have bought a Xbox Controller I want to know is this normal for Xbox One controller or not?


The controller was defective and now it has been replaced and there is no such problem with new one.