Hi there,
try adding this CSS to move the sticky nav down the height of your barra-superior element:
#sticky-navigation,
#mobile-header.is_stuck {
top: 33px !important;
}
/* adjust position when admin bar is shown */
.admin-bar #sticky-navigation,
.admin-bar #mobile-header.is_stuck {
top: 66px !important;
}
If you alter the height of the bar – then you will need to adjust the top: 33px
to suit. Likewise the second part of the code considers the admin bar height for when your logged in.