Drag & Drop not working properly on iPad (canvas/html5)

i want create simple drag & drop exercise, on ipad "drag & drop" not working properly.

here code:

var = this;

createjs.touch.enable(stage);

stage.enablemouseover(10);

function initpage() {

var shape = new createjs.shape();

shape.graphics.beginfill("#999999").drawroundrect(100,100,140,60,8).endfill();

shape.on("mousedown", function(evt) {

this.alpha = 0.8;

this.offset = {x: this.x - evt.stagex, y: this.y - evt.stagey};

});

shape.on("pressmove", function(evt) {

this.x = evt.stagex + this.offset.x;

this.y = evt.stagey + this.offset.y;

});

shape.on("pressup", function(evt) {

this.alpha = 1;

});

that.addchild(shape);

}

initpage();

i can drag shape, more move it, more moves away finger. here video recorded:

any ideas wrong?

edit:

ok seems problem lies within "makeresponsive" function part of default html template.

problem is, if deactivate resolution on retina ipad worse (but drag & drop working).

@adobe, please release bugfix asap

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