Hi there,
Can you try adding this CSS?:
.rtl .main-navigation ul ul, .rtl .secondary-navigation ul ul.sub-menu {
right: -999999px;
}
.rtl.dropdown-hover .main-navigation ul li.sfHover > ul,
.rtl.dropdown-hover .main-navigation ul li:hover > ul,
.rtl.dropdown-hover .secondary-navigation ul li.sfHover > ul,
.rtl.dropdown-hover .secondary-navigation ul li:hover > ul {
right: 0;
}
.rtl.dropdown-hover .main-navigation ul ul li.sfHover > ul,
.rtl.dropdown-hover .main-navigation ul ul li:hover > ul,
.rtl.dropdown-hover .secondary-navigation ul ul li.sfHover > ul,
.rtl.dropdown-hover .secondary-navigation ul ul li:hover > ul {
right: 100%;
}