My logo doesn't appear on the Mobile version, instead displays page title

Site URL: http://www.masterson.nyc

On some pages, like my homepage, the logo doesn't appear, and instead displays the Site title (Masterson Architecture & Design) instead of the logo (set of stairs)

Add to Design > Custom CSS to fix problem

/* mobile site title to logo */
span#mobile-navigation-title a {
    background-image: url(http://images.squarespace-cdn.com/content/v1/55d678bce4b07505265672c6/3e594fde-3431-40d4-8c60-336ed83570b3/MASTERSON%252B-logo-black.jpg?format=1500w);
    background-size: contain;
    color: transparent;
    background-repeat: no-repeat;
    background-position: center cneter;
}