Div在页面上“跳跃”

I made chat, and I am using ajax to refresh messages

function loadlink(){
    $('#porukice').load('messages.php',function () {
         $(this).unwrap();
    });
}

loadlink(); // This will run on page load
setInterval(function(){
    loadlink() // this will run after every 5 seconds
}, 2000);

The div

<div  id="porukice" style=""></div>

Is moving over a page three times, then it stops but in odd place. The first time element appear on page everything is fine, but after 2 ajax reloads it change place and stops, ajax still works. I really can't figure out why is this happening.

That is how it moves with ajax reload.

You guys wont believe what was problem.
I just realized that because text input box had size="150"set, div element above jumped like insane. It's fixed now.