Anyone know how to fix this?

The Navbar when you toggle, it closed before the items.

       <nav class="mb-2 navbar navbar-expand-lg fixed-top navbar-light white scrolling-navbar">
            <div class="container">
                <a class="navbar-brand" href="/">
                    <img src="/img/Icon7.png" style="height: 30px; padding-right: 5px; margin-bottom: 5px;" />Demo</a>

                <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent-555"
                    aria-controls="navbarSupportedContent-555" aria-expanded="false" aria-label="Toggle navigation">
                    <span class="navbar-toggler-icon"></span>
                </button>

                <div class="collapse navbar-collapse" id="navbarSupportedContent-555">
                    <ul class="navbar-nav mr-auto">
                        <li class="nav-item">
                            <a class="nav-link" href="#">Home
                            </a>
                        </li>
                        <li class="nav-item">
                            <a class="nav-link" href="#">Features</a>
                        </li>
                    </ul>
                </div>
            </div>
        </nav>