Hello,
Thank you for contacting us.
By default, WooCommerce opens first tab when page is loaded. You can try to close it manually right after page loading by adding this code snippet to the Custom JS section in Theme Settings
setTimeout(function() {
var $tabs = jQuery( '.wc-tabs, ul.tabs' ).first();
$tabs.parent().find('#tab-description').hide();
$tabs.parent().find( '.tab-title-description' ).removeClass('active');
}, 10);
Regards