Strange turn.js behavior

Strange turn.js behavior

good Day every one. I'm doing simple magazine project wuth turn.js.
i faced strange bahavior prior to my scripts:
var pageWidth = 280;
var pageHeight = 400;
$('.magazine img').each(function(index, element) {
$(this).width(pageWidth);
$(this).height(pageHeight);
});
$('.magazine').turn({
width: pageWidth*2,
height: pageHeight,
when:{
}
});
$('.magazine-viewport').zoom({
flipbook: $('.magazine'),
max: 3,
when:{
tap: function(event){
if ($(this).zoom("value")==1) {
$(this).zoom("zoomIn", event);
} else {
$(this).zoom("zoomOut");
}
}
}
});
When user taps on magazine, it zoomes and then disaperas. Google gives
nothing useful..