jquery ui bug?

jquery ui bug?

my code:

...

$(function() {
  $(".cenrows").sortable({
   connectWith: '.cenrows',
   change: function(event, ui){
    alert(event.target.innerHTML);
         }
  });
 });






</head>
<body>

<div class="cenrows" id="cloa">
         <div class="mu_conn">
             a
            </div>
            <div class="mu_conn">
             b
            </div>
            <div class="mu_conn" >
             c
            </div>
        </div>
        <div class="cenrows" id="clob">
         <div class="mu_conn">
             d
            </div>
        </div>
</div>















</body>
</html>

1."d"  move "cloa" 

alert one: <DIV style="Z-INDEX: 1000; POSITION: absolute; WIDTH: 168px; HEIGHT: 19px; TOP: 9px; LEFT: 89px" class="mu_conn ui-sortable-helper" jQuery1280507473426="6">d </DIV>

alert two <DIV class=mu_conn jQuery1280507600572="2">a </DIV>

<DIV style="HEIGHT: 19px; VISIBILITY: hidden" class="mu_conn ui-sortable-placeholder"></DIV>

<DIV class=mu_conn jQuery1280507600572="3">b </DIV>

<DIV class=mu_conn jQuery1280507600572="4">c </DIV>

is good

now move 'd' to 'clob'

alert one :<DIV class=mu_conn jQuery1280507600572="2">a </DIV>

<DIV style="Z-INDEX: 1000; POSITION: absolute; WIDTH: 168px; HEIGHT: 19px; TOP: 4px; LEFT: 196px" class="mu_conn ui-sortable-helper" jQuery1280507600572="6">d </DIV>

<DIV class=mu_conn jQuery1280507600572="3">b </DIV>

<DIV class=mu_conn jQuery1280507600572="4">c </DIV>

alert two :<DIV style="HEIGHT: 19px; VISIBILITY: hidden" class="mu_conn ui-sortable-placeholder"></DIV>

is good

But do not release the mouse ,

Will be 'd' move back to 'cloa'

alert one :<DIV class=mu_conn jQuery1280507871633="2">a </DIV>

<DIV style="Z-INDEX: 1000; POSITION: absolute; WIDTH: 168px; HEIGHT: 19px; TOP: 27px; LEFT: 93px" class="mu_conn ui-sortable-helper" jQuery1280507871633="6">d </DIV>

<DIV style="HEIGHT: 19px; VISIBILITY: hidden" class="mu_conn ui-sortable-placeholder"></DIV>

<DIV class=mu_conn jQuery1280507871633="3">b </DIV>

<DIV class=mu_conn jQuery1280507871633="4">c </DIV>

alert two :<DIV class=mu_conn jQuery1280507871633="2">a </DIV>

<DIV style="Z-INDEX: 1000; POSITION: absolute; WIDTH: 168px; HEIGHT: 19px; TOP: 27px; LEFT: 93px" class="mu_conn ui-sortable-helper" jQuery1280507871633="6">d </DIV>

<DIV style="HEIGHT: 19px; VISIBILITY: hidden" class="mu_conn ui-sortable-placeholder"></DIV>

<DIV class=mu_conn jQuery1280507871633="3">b </DIV>

<DIV class=mu_conn jQuery1280507871633="4">c </DIV>

Why not Return:

alert one:<DIV style="Z-INDEX: 1000; POSITION: absolute; WIDTH: 168px; HEIGHT: 19px; TOP: 9px; LEFT: 89px" class="mu_conn ui-sortable-helper" jQuery1280507473426="6">d </DIV>

alert two :<DIV class=mu_conn jQuery1280507871633="2">a </DIV>

<DIV style="Z-INDEX: 1000; POSITION: absolute; WIDTH: 168px; HEIGHT: 19px; TOP: 27px; LEFT: 93px" class="mu_conn ui-sortable-helper" jQuery1280507871633="6">d </DIV>

<DIV style="HEIGHT: 19px; VISIBILITY: hidden" class="mu_conn ui-sortable-placeholder"></DIV>

<DIV class=mu_conn jQuery1280507871633="3">b </DIV>

<DIV class=mu_conn jQuery1280507871633="4">c </DIV>

???????