Why elements in XML-file are not in place in other devices?

[drummer_guitar_girl]

Sorry for my English. I have problem. Why the elements in RelativeLayout in the wrong place in other devices? That is, in a Thumbnail "Nexus S" - I do not have problems. But in "Thumbnail Nexus 7" - I have an element is in the wrong place. Why?And how to solve this problem? Please help.This's screenshot:http://4.bp.blogspot.com/-ZzCStZrLoCw/UVq1VtihFbI/AAAAAAAAAFs/27knrsIYp8w/s1600/sda.png