Hi Shaun,
Upon checking, the issue is because of the following custom CSS:
.x-navbar .sub-menu {
position: absolute;
display: none;
float: left;
min-width: 200px;
margin: 0;
padding: 0.75em 0;
font-size: 13px;
list-style: none;
background-color: #fff;
z-index: 1000;
border-radius: 0px;
-webkit-background-clip: padding-box;
background-clip: padding-box;
-webkit-box-shadow: 0 3px 5px rgba(0,0,0,0.25);
box-shadow: none;
}
Please remove the following 3 lines of code from that:
position: absolute;
display: none;
float: left;
It overrides the default settings.
Hope this helps.