Adobe Animate CC Drag and Drop

Hi! I just created a drag and drop word game using Adobe Animate CC.

Everything is working fine, except when there is 2 same letters on 1 word, the letter is only accepted by one slot. So I have to try both letters just to see which one will work on that specific slot. It makes the game frustrating for the user.

Here's the link to the game 

And here is my code:

var root = this;
var pieces = root.pieces;
var slots = root.slots;
var restart = root.restart;
var winMessage = root.winMessage;
var positions = [];

root.setup = function()
{
document.body.style.backgroundColor = lib.properties.color;
createjs.Touch.enable(stage);
stage.mouseMoveOutside = true;
root.drawStart = stage.on("drawstart", root.start, null, true);
};

root.start = function(e)
{
stage.off("drawstart", root.drawStart);
winMessage.originalY = winMessage.y;

pieces.children.forEach(function(child, index)
{
positions[index] = {x:child.x, y:child.y};
});

slots.children.forEach(function(child, index)
{
child.mouseChildren = false;
});

root.restartHandler(null);
restart.on("click", root.restartHandler);
pieces.on("mousedown", root.mouseDownHandler);
};

root.restartHandler = function(e)
{
pieces.count = 0;
winMessage.text = "";
root.shuffle();
};

root.mouseDownHandler = function(e)
{
e.currentTarget.setChildIndex(e.target, e.currentTarget.children.length - 1);
e.target.offsetX = (e.stageX / stage.scaleX) - e.target.x;
e.target.offsetY = (e.stageY / stage.scaleY) - e.target.y;
pieces.target = e.target;
root.stageMouseMove = stage.on("stagemousemove", root.stageMouseMoveHandler);
root.stageMouseUp = stage.on("stagemouseup", root.stageMouseUpHandler);
};

root.stageMouseMoveHandler = function(e)
{
if (pieces.target)
{
pieces.target.x = (e.stageX / stage.scaleX) - pieces.target.offsetX;
pieces.target.y = (e.stageY / stage.scaleY) - pieces.target.offsetY;
}
};

root.stageMouseUpHandler = function(e)
{
stage.off("stagemousemove", root.stageMouseMove);
stage.off("stagemouseup", root.stageMouseUp);

if (pieces.target)
{
root.check();
pieces.target = null;
}
};

root.shuffle = function()
{
positions.sort(function(a, b)
{
return 0.5 - Math.random();
});

pieces.children.forEach(function(child, index)
{
child.originalX = positions[index].x;
child.originalY = positions[index].y;
child.mouseEnabled = true;
createjs.Tween.get(child).to({x:child.originalX, y:child.originalY}, 350, createjs.Ease.backInOut);
});
};

root.check = function()
{
var spot = slots.getObjectUnderPoint(pieces.target.x, pieces.target.y);

if (!spot)
{
root.onMiss();
return;
}

root.slot = spot.parent;

if (root.slot)
{
if (pieces.target.name === root.slot.name)
{
root.onMatch();

if (pieces.count === pieces.children.length)
root.onWin();
}
else
root.onMiss();

root.slot = null;
}
else
root.onMiss();
};

root.onMatch = function()
{
createjs.Sound.play("match_sfx");
pieces.target.mouseEnabled = false;
pieces.count++;
createjs.Tween.get(pieces.target).to({x:root.slot.x, y:root.slot.y}, 350, createjs.Ease.backInOut);
};

root.onWin = function()
{
createjs.Sound.play("correct_buzzer");
root.gotoAndStop(root.timeline.position + 1);

};

root.onMiss = function()
{
createjs.Sound.play("miss_sfx");
createjs.Tween.get(pieces.target).to({x:pieces.target.originalX, y:pieces.target.originalY}, 350, createjs.Ease.backInOut);
};

root.setup();

Sorry I'm really new to this. Would appreciate your help!