Looks like it’s coming from this code you added –
.genesis-nav-menu .menu-item:hover {
position: static;
}
and this –
.menuorange:hover {
background-color: #fa902d;
color: #fff;
position: relative;
top: -2px;
}
It looks like there is another one with top: -3px;
…..this is all what is causing the hover movement that you see.