Offset area pressing the button (Unity 5.5.0)

Hi.
I have a problem. On the panel added 10 images and each component is added “button”.
Area clicking on each element beyond the bounds of the element and it turns out that by pointing to the first element stands second, etc.
Why is this happening? What is the problem?

Figured out the problem. If the size of the child size of the button larger than the button that is why it is considered the size of the child object. But that’s not right.