Hi Alex Thanks for helping me, its not in backoffice its in the main menu who is rendering menu.

I tried to delete the pageid(1080) that i had change documenttype for but it still showing two pages in menu and this in backoffice

 This document is published but its url would collide with content /home/page(id=1080)

    @{
    var site = Model.Site();
    var selection = site.Children.Where(x => x.IsVisible());
}



<ul>
    <li><a href="/" id="show-logo" class=" margin-top-menu"></a></li>
    <li class="@Html.Raw(Model.Id == site.Id ? "is-active" : "")"><a class="nav-link " href="@site.Url">@site.Name</a></li>
    @foreach (var item in selection)
    {
        <li class="@(item.IsAncestorOrSelf(Model) ? "is-active" : null)"><a class="nav-link " href="@item.Url">@item.Name</a></li>
    }
</ul>