I tested with jquery mobile 'tap' event and found it fired two times, everytime it is triggered. Code as below for a html page:

<!DOCTYPE html>
<html>
<head>
    <title>Demo</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">    
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>    
    <script src="http://code.jquery.com/mobile/1.1.0/jquery.mobile-1.1.0.js"></script>      
    <style>
        #box{
            background-color:red;
            width:200px;
            height:200px;
        }   
    </style>
</head>
<body>
    <div id="box">
        tapped me
    </div>
    <script type="text/javascript">
        $(document).ready(function() {
            $('#box').bind('tap',function(event) {
                alert('why');
            }); 
        });
    </script>
</body>
</html>

More irony is when I test this over jsfiddle, it only fired the event for one time.

Here's the link. http://jsfiddle.net/mochatony/tzQ6D/6/

After further testing I found out the bug has gone away with placing the javascript at header section.

<!DOCTYPE html>
<html>
<head>
    <title>Demo</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">    
    <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js">
    </script>
    <script type="text/javascript" src="http://code.jquery.com/mobile/1.1.0/jquery.mobile-1.1.0.js">
    </script>
    <style type="text/css">
        #box{ background-color:red; width:200px; height:200px; }
    </style>
    <script
jquery jquery-mobile
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