Fancybox is repeating pictures - fancybox

Question

i have created a gallery using fancy-box but i have a problem that when i open all items (all projects) it works properly as each item will show its own pictures (only three picture) as shown in this picture
(have only three thumbnails) but when i open a specific category (villas category) pictures for all villas will shown as this picture
(6 thumbnails included for two projects)
and if i press all project again i will have the same problem and the picture for all items will be shown (9 thumbnails for 3 items)
so i think the problem is with the java script and here below is the html code and java script code
sorry i am new to programming and i need your help, i appreciate your efforts
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="js/bootstrap.js"></script>
<script type="text/javascript">
jQuery(function ($) {
// fancybox
$(".fancybox").fancybox({
modal: false, // enable regular nav and close buttons
// add buttons helper (requires buttons helper js and css files)
padding:0,
helpers: {
thumbs : {
width : 50,
height : 50,
},
}
});
// filter selector
$(".filter").on("click", function () {
var $this = $(this);
// if we click the active tab, do nothing
if ( !$this.hasClass("active") ) {
$(".filter").removeClass("active");
$this.addClass("active"); // set the active tab
// get the data-rel value from selected tab and set as filter
var $filter = $this.data("rel");
// if we select view all, return to initial settings and show all
$filter == 'all' ?
$(".fancybox")
.attr("data-fancybox-group", "gallery")
.not(":visible")
.fadeIn()
: // otherwise
$(".fancybox")
.fadeOut(0)
.filter(function () {
// set data-filter value as the data-rel value of selected tab
return $(this).data("filter") == $filter;
})
// set data-fancybox-group and show filtered elements
.attr("data-fancybox-group", $filter)
.fadeIn(1000);
} // if
}); // on
}); // ready
</script>
<div id="galleryTab">
<a data-rel="all" href="javascript:;" class="filter active">All Projects</a>
<a data-rel="vil" href="javascript:;" class="filter">Villas</a>
<a data-rel="res" href="javascript:;" class="filter">Residential and Commercial</a>
<a data-rel="mix" href="javascript:;" class="filter">Mixed Used</a>
</div>
<div class="row"> </div>
<div class="col">
<div class="galleryWrap">
<ul id="projects">
<li id="liproject" data-tags="Villas"><a title="Mr.Omran Villa (G+1+R)" class="fancybox villa" data-filter="vil" rel="villa1" href="images/Projects/1.jpg"><img src="images/Projects/1s.jpg" alt="omran" width="240" height="160" class="img-responsive" id="img1"></a></li>
<div class="hidden"> <a class="fancybox" data-tags="Villas" data-filter="vil" rel="villa1" href="images/Projects/1h.jpg"><img src="images/Projects/1h.jpg" alt="omran"></a> <a class="fancybox" data-tags="Villas" data-filter="vil" rel="villa1" href="images/Projects/12h.jpg"><img src="images/Projects/12h.jpg" alt="omran"></a> </div>
<div> <li data-tags="Villas"><a title="Mr.saif Villa (G+1+R)" data-tags="Villas" class="fancybox" data-filter="vil" rel="villa2" href="images/Projects/2.jpg"><img src="images/Projects/2s.jpg" alt="saif" class="img-responsive" id="img2"></a></li>
<div class="hidden"> <a class="fancybox" data-tags="Villas" data-filter="vil" rel="villa2" href="images/Projects/21h.jpg"><img src="images/Projects/21h.jpg" alt="saif"></a> <a class="fancybox" data-tags="Villas" data-filter="vil" rel="villa2" href="images/Projects/22h.jpg"><img src="images/Projects/22h.jpg" alt="saif"></a> </div>
<div id="res"> <li data-tags="bldg"><a title="Ajman Tower (G+8Podium+26 Typical+R)" class="fancybox" data-tags="Residential and Commercial" data-filter="res" rel="bldg1" href="images/Projects/4.jpg"><img src="images/Projects/4s.jpg" alt="ajman" width="240" height="160" class="img-responsive" id="img3" border="0"></a></li>
<div class="hidden"> <a class="fancybox" data-filter="res" rel="bldg1" href="images/Projects/41h.jpg"><img src="images/Projects/41h.jpg" alt="ajman"></a> <a class="fancybox" data-filter="res" rel="bldg1" href="images/Projects/42h.jpg"><img src="images/Projects/42h.jpg" alt="ajman"></a> </div>
</div>
</div>
</ul>
</div>
</div>
<footer>©Copyright Qyas Engineering Consultancy All Rights Reserved. </footer>
</div>

Answer 1

I would suggest you to use Isotope + fancybox combination, see this example:
http://codepen.io/fancyapps/pen/EZKYPN
Because then your code could be simplified to something like this:
// Custom click event - open fancyBox manually
$('.fancybox').on('click', function() {
var visibleLinks = $('.fancybox:visible');
$.fancybox.open( visibleLinks, {}, visibleLinks.index( this ) );
return false;
});