I see it in the top left area of the scree, it happen only on Chrome, can you help me?

i’ve used also this function to change logo only in homepage:

//change logo only in Homepage
add_filter('avf_logo','av_change_logo');
function av_change_logo($logo)
{
    if(is_page(202))
    {
    $logo = "http://web.demo.cefriel.com/wp-content/uploads/Logo2.png";
    }
    return $logo;
}

But i need to change it also when scroll down

Hi,
sorry but the content is private, and for the company policy i can’t show to you, aniway i haven’t touch the code yet so the template is pure.
Thank