Issues with main nav (menu) since latest update

Since the latest update I have an issue with my menu in that I have a drop down list that I cannot navigate as it won’t let me scroll the site down to see and jumps across the page.

I have a number of plugins and have switched them all off and back on after conducting conflict checks.

I have made a number of changes in the CSS re: snippets, and checked them all to see if there is a conflict but can’t see one.

the site is https://www.forcesonline.org.uk

I have tried the site without the child theme and still get a conflict,

Here is the CSS in the child theme

‘/* Change font-size, alignment as needed */
footer#footer p, footer#footer a {
padding: 0px ;
font-size: 1.0em ;
text-align: center;
line-height: 1.2em ;
}

/* Change font-size of Titles */
footer#footer h3{
font-size: 1em ;
line-height: 1.2em ;
}

/* Header Social Icons */
.navbar-inner .social-block {
font-size: 1.8em;
}

/* Footer Social Icons */
.colophon .social-block {
font-size: 1em;
text-align: left ;
}

.navbar.notresp .nav > li > a, .navbar.notresp .nav > li > a:hover {
border-radius: 7px 7px 7px 7px; /* No Rounded corners */
min-width: 30px; /* Fixed width */
min-height: 0px; /* Fixed height */
vertical-align: middle; /* Align text */
}

/* Shading */
.navbar .nav > li > a, ul.dropdown-menu, ul.dropdown-submenu,
.dropdown-menu > li > a, .dropdown-submenu > li > a, .dropdown-menu > li.current-menu-ancestor > a,
.navbar .nav > li > a:focus, .dropdown-menu > li > a:focus, .dropdown-submenu:focus > li > a,
.nav-collapse .nav > li > a, .nav-collapse .dropdown-menu a

{
border: 0px solid yellow; /* Add a border */
color: white;
font-size: 12px; /* White text */
font-weight: bold;
text-shadow: none; /* Remove text shadow */
background-color: black; /* Change black */
background-image: linear-gradient(to bottom, grey, black); /* Change grey, black */
background-image: -webkit-linear-gradient (top, grey, black); /* Change grey, black */
background-repeat: repeat-x;
}

.navbar .nav > li > a:hover, .dropdown-menu > li:hover > a, .dropdown-menu > li > a:hover, .dropdown-submenu:hover > li > a,
.navbar .nav > li > a:focus, .dropdown-menu > li:focus > a, .dropdown-menu > li > a:focus, .dropdown-submenu:focus > li > a,
.navbar .nav > li.current-menu-item > a, .navbar .nav > li.current-menu-ancestor > a,
.dropdown-menu > li.current-menu-item > a, .dropdown-menu > li.current-menu-ancestor > a,
.dropdown-submenu > li.current-menu-ancestor > a, .dropdown-menu > li:hover > a {
color: yellow; /* Yellow Text on hover */
font-weight: bold;
background-color: maroon; /* Change darkgreen */
background-image: linear-gradient(to bottom, maroon, red); /* Change maroon, red Light Green */
background-image: -webkit-linear-gradient (top, maroon, red); /* Change maroon, red Light Green */

}

/* OPTION 1/1 – CENTER MENU */
.navbar-wrapper .navbar.notresp {
float: center;
width: 100%;
margin: 0 auto;

}

/* Hide surrounds on 3-bar menu */
.navbar ul.nav, .navbar ul.dropdown-menu, .navbar ul.dropdown-submenu,
.navbar .nav-collapse.tc-hover-menu-wrapper {
background: white;
background-color: rgba(0, 0, 0, 0); /* Transparent */
border: none;
box-shadow: none;
}
/* Fixed width on 3-bar menu */
.navbar.resp ul.nav, .navbar.resp ul.dropdown-menu, .navbar.resp ul.dropdown-submenu,
.navbar.resp .nav-collapse.tc-hover-menu-wrapper {
min-width: 180px; /* Adjust to need */
}

body {
/* Adjust the Image location ‘wp-content/uploads/NAMEOFFILE.png’ */
background: url(/wp-content/uploads/fubackground.png) repeat 0 0 ;
}

/* Set the color (#FAFAFA) of the internal body */
#main-wrapper {

background: url(/wp-content/uploads/bodybackgroundimage.png) repeat 0 0 ;
background-color: #FAFAFA;
margin-top: 0px ;
margin-bottom: 0px;
}

header.tc-header {
/* Adjust the Image location ‘wp-content/uploads/NAMEOFFILE.png’ */
background: url(/wp-content/uploads/fuheaderbackground.png) repeat 0 0;
}

footer#footer {
background: url(/wp-content/uploads/fufooterbackground.png) repeat 0 0;
color: white;
}

footer#footer .colophon {
/* Adjust the Image location ‘wp-content/uploads/NAMEOFFILE.png’ */
background: url(/wp-content/uploads/fufooterbackground.png) repeat 0 0 ;

}

/* Center the widget text areas */
footer#footer {
text-align: center ;
}

/* Or left-center-right the widget text areas */
#footer_one {
text-align: left ;
}
#footer_two {
text-align: center ;
}
#footer_three {
text-align: right ;
}

/* Remove all Navbar Box colours and shading (Credit: @electricfeet) */
.navbar,
.navbar .navbar-inner,
.navbar .nav {
webkit-box-shadow: none;
-moz-box-shadow: none;
box-shadow: none;
background: none;
filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
}

/* 2px=thickness, solid=style (dotted – dashed – solid – double – groove – ridge – inset – outset), green=color */
header.tc-header {
border-bottom: 2px solid black;
}

.navbar-wrapper .navbar h2, h2.site-description {
/* Change (red) font color */
color: white;
/* Change (Garamond) font family */
font-family: britanic bold;
/* Change (20px) font size */
font-size: 25px;
/* Change (19%) move to left */
padding-right: 0%;
/* Change (normal) italic-normal-oblique */
font-style: bold;

}

/* Move Tagline to Left */
.navbar-wrapper .navbar h2 {
float: right;
margin-top: 5px;
margin-left: 10px;
text-align: right;
line-height: 30px;
}

/* Change the central wrapper background */
#main-wrapper {
margin-top: 0px ;
margin-bottom: 0px ;
background-color: ; /* Change pink */
border: 2px solid red ; /* Delete if no border needed */
padding: 0px 10px 0px 20px ;
}
.container[role=”main”] {
background-color: ; /* Change pink */
}

/* Change the Footer background */
footer#footer .colophon {
background-color: pink; /* Change pink */
}

/* Remove grey bar */
footer#footer {
border-top: 2px solid black;
color: #5A5A5A;
padding: 0;
}

/* Remove grey bar */
footer#footer {
border-bottom: 2px solid black;
color: #5A5A5A;
padding: 0;
}

/* Reduce whitespace */
#main-wrapper {
margin-bottom: 0px;
}

/* 2px=thickness, solid=style (dotted-dashed-solid-double-groove-ridge-inset-outset), red=color */
#customizr-slider {
border-bottom: 2px solid black;
}

/* Change the color of all the Social Icons */
.navbar-inner a.social-icon {color:red;} /* Header */
footer#footer .colophon a.social-icon {color:white;} /* Footer */
}

/* remove previous/next arrows from home page only */
.home .carousel-control {
display: none ;
}

/* Adjust the Slider Height */
#customizr-slider.carousel .item {
height: 450px;
min-height: 450px;
line-height: 450px;
}

@media (max-width: 1200px){
#customizr-slider.carousel .item {
height: 308px;
min-height: 308px;
line-height: 308px;
}

@media (max-width: 979px){
#customizr-slider.carousel .item {
height: 247px;
min-height: 247px;
line-height: 247px;
}

@media (max-width: 767px){
#customizr-slider.carousel .item {
height: 246px;
min-height: 246px;
line-height: 246px;
}

@media (max-width: 480px){
#customizr-slider.carousel .item {
height: 152px;
min-height: 152px;
line-height: 152px;
}

@media (max-width: 320px){
#customizr-slider.carousel .item {
height: 112px;
min-height: 112px;
line-height: 112px;
}

/* Make Carousel fade – adapt 2s to required delay */
.carousel-inner > .item {
-webkit-transition: opacity 2s ease-in-out ;
transition: opacity 2s ease-in-out ;
}
.carousel-inner > .next.left,
.carousel-inner > .prev.right {
opacity: 1;
z-index: 1;
left: 0;
}
.carousel-inner > .active.left {
opacity: 0;
z-index: 2;
left: 0;
}
.carousel-inner > .active.right {
opacity: 0;
z-index: 2;
left: 0;
}

/* remove previous/next arrows from home page only */
.home .carousel-control {
display: none ;

}
‘