i discovered the reason for this it was the register user control when i added to the page this issue occurred

<%@ Register TagPrefix="dnn" TagName="REGISTER" Src="~/DesktopModules/Admin/Security/Register.ascx" %>

and i was trying to add this as a newsletter subscription form at the footer of the pages like this

<div Class="right footer-registration"><dnn:REGISTER runat="server" id="dnnRegister" ></dnn:REGISTER></div>

and i used some jquery to remove elements not needed and add some style like this

$(window).load(function() {
        $(".footer-registration .dnnFormHelp").removeClass("dnnFormHelp");
        $(".footer-registration ul.dnnActions li:eq(1),.footer-registration .dnnSocialRegistration").remove();
        $(".footer-registration .dnnForm.dnnForm").addClass("right");
        $("#dnn_dnnRegister_userForm_Email_Email_TextBox").attr("placeholder", $(".footer-registration #dnn_dnnRegister_userForm_Email_Label").text());
        $(".footer-registration .dnnPrimaryAction").text("Subscribe").addClass("subscribe-btn");

});