Dropdown not closing

[birdbrainsolutions]

Hi,

Firstly thank you for creating this plugin.

I'm writing a wordpress theme for the first time, so please bear with me if the question is stupid.

I added the css/js files to wordpress, and added the nav menu in the header

<header id="masthead" class="site-header">
		<div class="header-container">
			<div class="grt-menu-logo">
            	<h1>bbscores</h1>
            </div>
            <div class="grt-menu-right">
            	<nav>
                  <button class="grt-mobile-button">
                    <div class="line1"></div>
                    <div class="line2"></div>
                    <div class="line3"></div>
                  </button>
                  <ul class="grt-menu">
                    <?php
                        wp_nav_menu( array(
                                'theme_location' => 'menu-1',
                                'menu_id'        => 'primary-menu',
                            )
                        );
					?>
                  </ul>
                </nav>
            </div>
		</div><!-- header-container -->

	</header><!-- #masthead -->

and the menu is working fine on mobile (atleast on resizing the browser), however on desktop, the menu remains open. You can see it on the test site here: https://bbscores.litespeedwp.tk/

Please help, thank you!

yours sincerely,

Nick