Submit form data with ajax helper only work when the debug is on

As captioned, this is very strange that i can't figure it out till
now.
I'm using Cakephp with the jquery to submit the form.

I've spent sometime to investigate the issue, here is my script in
html source

//<![CDATA[
jQuery('#form56388588').submit( function() {
jQuery('#form56388588').ajaxSubmit({
beforeSend:function(request) {
request.setRequestHeader('X-Update', 'myicons');},
success:function(data, textStatus) {
jQuery('#myicons').html(data);}, async:true, type:'post',
url:'/mysite/markers/add'}); return false;});
//]]>

Please be noted that when debug is on and off the html sources are
exactly the same but they come up with different enddings.

When debug is off the "data" in sucess function is empty, while i can
see sth when debug is on

This is a view page named add.ctp which is under the control of my
Markers Controller.

I'm suffering from it for 3 days, can anyone help?

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