I have checked your question and it seems to be working fine at my PC. I would appreciate if you can share browser information for further investigation. Meanwhile, I am sharing the code which is working perfectly.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title> New Document </title>
<meta name="Generator" content="EditPlus">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
</head>
<body>
<div class="content">Lorem Ipsum</div>
<div class="content">Lorem Ipsum</div>
<div class="content">Lorem Ipsum</div>
<div class="content">Lorem Ipsum</div>
<div class="content">Lorem Ipsum</div>
<div class="content">Lorem Ipsum</div>
<div class="content">Lorem Ipsum</div>
<div class="content">Lorem Ipsum</div>
</body>
<script>
$(function()
{
$('.content').click(function() {
$(this).html('Hello');
})
});
</script>
</html>
solved All the div content changing when clicking only one div in the foreach loop