Mobile menu scroll problems

I had CSS in place that allowed a sticky mobile menu and scrolling on mobile. Now it suddenly stopped working and I can’t find why. Can you help me get the mobile menu sticky again—so we can scroll in mobile without scrolling the menu too?

Here is the CSS that’s been working:

____________________________________________________________________

/* —- KEEP MOBILE MENU VISIBLE SCROLL —- */

#advanced_menu_toggle, #advanced_menu_hide {
position: fixed !important;
right: 3% !important;
top: 5% !important;
}

@media only screen and (max-width: 1200px) {
#wrap_all {overflow: hidden !important; /*needed for mobile menu scrolling */}
}

@media only screen and (max-width:1200px; min-width: 768px) {
.responsive #top #wrap_all #header {
position: fixed !important;
}
.responsive #top #main {
padding-top: 80px !important;
}
}

@media only screen and (max-width: 1200px) {
#top #menu-item-search {
display: none;
}
}

@media only screen and (max-width: 1200px) {
.main_menu{ right: -5px !important;}
}

/* —- END KEEP MOBILE MENU VISIBLE SCROLL —- */

Here is the mobile breakpoint CSS:

_______________________________________________________

/* —- MOBILE MENU BREAKPOINT —- */

@media only screen and (max-width: 1200px; min-width: 768px) {
.html_mobile_menu_tablet .main_menu , .html_mobile_menu_tablet #header_main_alternate{display:none !important;}
.html_mobile_menu_tablet .container #advanced_menu_toggle, .html_mobile_menu_tablet #advanced_menu_hide{display:block !important;}
.html_mobile_menu_tablet #mobile-advanced{display:block !important;}
}

/* —- SIDEBAR MOBILE BREAKPOINT —- */

@media only screen and (max-width: 989px) {
.responsive #top .container .av-content-small, .responsive #top #wrap_all .flex_column, .responsive #top #wrap_all .av-flex-cells .no_margin {
margin: 0;
margin-bottom: 20px;
width: 100%;
}
.responsive .content{
border:none;
}
}

/* —- FIREFOX SIDEBAR MOBILE BREAKPOINT —- */

@media only screen and (max-width: 989px) {
.responsive .sidebar{
clear: both !important;
}
}

/* —- END SIDEBAR MOBILE BREAKPOINT —- */

/* —- END MOBILE MENU BREAKPOINT —- */