Only One Checkbox to be Checked in combination with isotope not working in Safari

Isotope filtering on my website is not working correctly in Safari. Here is the problem: I have two checkboxes, when clicking the first one it filters the items just well. When I click the second checkbox the first is unchecked but the filtering does not work correctly. Thats only in Safari, in Firefox and Chrome it's working fine. Here's the code:

    <script type="text/javascript">
    //<!--


    $(window).load(function(){
var $container = $('#isocontainer');
// initialize
$container.isotope({
    itemSelector: '.item'
});
    });

    $(window).resize( function() {
var $container = $('#isocontainer');
// initialize
$container.isotope({
    itemSelector: '.item'
});
    });


    $(function(){

    var $container = $('#isocontainer'),
    $checkboxes = $('#filters input');

    $container.isotope({
    itemSelector: '.item',
    animationEngine: 'jquery'
    });

    $checkboxes.change(function(){
    var filters = [];
    // get checked checkboxes values
    $checkboxes.filter(':checked').each(function(){
    filters.push( this.value );
    });

    filters = filters.join(', ');
    $container.isotope({ filter: filters });
    });

    var $items = $container.children();

    $('input:checkbox').click(function() {
    $('input:checkbox').not(this).prop('checked', false);
    });

    });//-->

    </script>

Anyone have any ideas? And just to let you know: I have only very, very poor knowledge in javascript ...