Botão de alternância da barra de navegação aberto, mas não fechado depois

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<nav class="navbar navbar-expand-lg navbar-dark" style="background-color: #134d8c;">
    <div class="container-fluid">
        <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
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        <div class="collapse navbar-collapse" id="navbarSupportedContent">
            <ul class="navbar-nav me-auto mb-2 mb-lg-0">
                <li class="nav-item">
                    <a href="/www" class="nav-link <?php echo ($page == 'home') ? 'active' : '' ?>">
                        <i class="fs-5 bi-house"></i> <span class="ms-1 me-2 d-none d-sm-inline">Home</span>
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                        <li><a href="turni_fissi_cucina.php" class="ms-1 me-2 nav-link <?php echo ($page == 'turni_fissi_cucina') ? 'active' : '' ?>">Fissi</a></li>
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</nav>