pressmove give offset

I'm trying to do a simple drag and drop using "pressmove."  The problem I'm having is that the object being dragged is only centered on the mouse pointer when it is a 0, 0 on the stage.  The further right I go, the more the object lags behind the cursor (object X  < cursor X).  The more down I go, the more the object lags in the Y direction.  So, it is perfect in the upper left-hand corner and totally off (~100 px) in both dimensions in the lower right corner.  What the heck?

var a17 = new lib.A17();
answer1Array.push(a17);
a17.addEventListener("pressmove", moveItem);

function moveItem (e){
e.currentTarget.x = e.stageX;
e.currentTarget.y = e.stageY;
}