Fix for the extra menu item highlighting when using standard and hamburger menu at the same time. Tested on ThemeFusion Avada 6.1.2.

avada-hamburger-highlight-bar.css

/* Disable the highlight bar over the hamburger menu by default. */
#menu-item-1374 > a {
    border-top-width: 3px;
    border-top-style: none;
}

/** Turn on the hamburger highlight bar when on a page in the hamburger menu.*/

/**
 * These two pages are in the hamburger menu. So, turn back on the highlight
 * bar when we are on these two pages. 
 */
.page-id-1368 #menu-item-1374 > a, .page-id-962 #menu-item-1374 > a {
    border-top-width: 3px;
    border-top-style: solid;
}

/**
 * On mobile, if we are on a top level nav page that also includes an
 * anchor link in the menu, only highlight the main top level nav
 * menu item. Turn off highlighting for the anchor menu item.
 */

/**
 * In this example, we're on the homepage. The homepage menu item
 * is highlighted. But, the Location menu item is also highlighted
 * because it's a link that points to an anchor on the homepage. So,
 * disable the redundant highlight by turning the bg colour the same 
 * as the menu bg colour. In this case, that colour it's white.
 */
.page-id-840 #mobile-menu-item-1374 > a {
    background-color: white !important;
}

.page-id-840 .fusion-mobile-current-nav-item:nth-child(2) > a {
    background-color: white !important;
}