input text field resets even if cancelling submit

i have a form which onsubmit i return false to cancel the submit action (that works fine). but the problem is that 开发者_高级运维even that the submit action was canceled the value on the text input gets erased from the input somehow...

search_form.onsubmit = submit_listener;
submit_listener = function(e){

    console.log(e);
    return false;   

never had this problem before...

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problem solved - stupid me:)

some other JS code i wrote did it....