Fixing scolling div position

[tartou2]

hello coders,

this issue is driving me to crazy since days, the full code works perfectly but i was able to locate a problem in this jquery part that keep refresh every sec. it works perfectly on pc but on mobile, if the div is scrolled up, everytime i try to scroll down, it keep doing autoscroll to somewhere in between

 

So if anyone can help me on how to make the div return to its position before the refresh

function loadchat(){       
        $.ajax({  
            url: "real_chat.php",  
            cache: false,  
            success: function(html){          
                $("#chatboard").html(html); 
            },  
        });
            return false;  
    }
setInterval (loadchat, 1000);

any help to fix the scrolling on mobile