Code below fixed it:
<script> jQuery(function($) { window.et_pb_smooth_scroll = function( $target, $top_section, speed, easing ) { var $window_width = $( window ).width(); $menu_offset = -1; if ( $ ('#wpadminbar').length && $window_width > 600 ) { $menu_offset += $( '#wpadminbar' ).outerHeight(); } //fix sidenav scroll to top if ( $top_section ) { $scroll_position = 0; } else { $scroll_position = $target.offset().top - $menu_offset; } // set swing (animate's scrollTop default) as default value if( typeof easing === 'undefined' ){ easing = 'swing'; } $( 'html, body' ).animate( { scrollTop : $scroll_position }, speed, easing ); } }); </script>