Android Window animation not working on physical device

Hello to everyone, I'm really new to Titanium, and I'm trying to practice, so sorry if I ask trivial questions. I've set a simple Window animation for android, and on the simulator (Genymotion, 4.1.1 API 16) it works, but if I test it on a physical device (4.1.2) I can't see the animation, I just view the new Window opening up without any transition. Any suggestion?

index.xml:

<Alloy>
    <Window class="container" id="indexWin" navBarHidden="true">
        <Label id="title" top="50">INDEX</Label>
        <Label id="labelNext" onClick="goNext">NEXT</Label>
        <Label id="labelPrev" onClick="goPrev">PREV</Label>
    </Window>
</Alloy>

index.js:

$.indexWin.open();
function goNext(e) {
    var showcat = Alloy.createController("showcat", []).getView();
    showcat.left = 600;
    showcat.open(Alloy.Globals.defaultAnimation);
}
function goPrev(e) {
    //
}

alloy.js:

Alloy.Globals.defaultAnimation = {
        activityEnterAnimation: Ti.Android.R.anim.slide_in_left,
        activityExitAnimation: Ti.Android.R.anim.slide_out_right
    };