Navigation bar / top menu is missing on pages with sliders

Known issue in:

• Parallax One theme
• Llorix One Lite theme

You should open up your theme's style.css file, look for probably this code:

.site-header-menu {
    display: none;
    flex: 0 1 100%;
}

Or:

.site-header-menu {
	display: none;
	-webkit-box-flex: 0;
	-webkit-flex: 0 1 100%;
	-ms-flex: 0 1 100%;
	flex: 0 1 100%;
}

And remove the display:none; from there.