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

I want to create a simple drag & drop exercise, but on the iPad "drag & drop" is not working properly.

Here is the code:

var that = 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 the shape, but the more I move it, the more it moves away from my finger. Here is a video I just recorded:

Any ideas what is wrong?

Edit:

Ok it seems the problem lies within the "makeResponsive" function which is part of the default HTML template.

Problem is, if I deactivate it the resolution on the Retina iPad is much worse (but drag & drop is working).

@Adobe, please release a bugfix asap

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