All menu link highlighted - one page site

Try changing it to this:

.rtl.home .main-navigation:not(.is_stuck) .main-nav ul li[class*="current-menu-"] > a {
	color: #3f3f3f;
	background-color: rgba(248,249,250,0.8);
}

.rtl.home .main-navigation:not(.is_stuck) .main-nav ul li[class*="current-menu-"] > a:hover {
	color: #ffffff;
	background-color: #760213;
}