Hello,
Sorry for late reply.
Kindly follow this: https://i.imgur.com/SRW0tlD.png

Go to theme style.css file
Remove line# 399-464
/* #access .menu-header ul,
div.menu ul {
list-style: none;
margin: 0;
}
#access .menu-header li,
div.menu li {
float: left;
position: relative;
}
#access a {
color: #aaa;
display: block;
line-height: 38px;
padding: 0 10px;
text-decoration: none;
}
#access ul ul {
box-shadow: 0px 3px 3px rgba(0,0,0,0.2);
-moz-box-shadow: 0px 3px 3px rgba(0,0,0,0.2);
-webkit-box-shadow: 0px 3px 3px rgba(0,0,0,0.2);
display: none;
position: absolute;
top: 38px;
left: 0;
float: left;
width: 180px;
z-index: 99999;
}
#access ul ul li {
min-width: 180px;
}
#access ul ul ul {
left: 100%;
top: 0;
}
#access ul ul a {
background: #333;
line-height: 1em;
padding: 10px;
width: 160px;
height: auto;
}
#access li:hover > a,
#access ul ul :hover > a {
background: #333;
color: #fff;
}
#access ul li:hover > ul {
display: block;
}
#access ul li.current_page_item > a,
#access ul li.current_page_ancestor > a,
#access ul li.current-menu-ancestor > a,
#access ul li.current-menu-item > a,
#access ul li.current-menu-parent > a {
color: #fff;
}
* html #access ul li.current_page_item a,
* html #access ul li.current_page_ancestor a,
* html #access ul li.current-menu-ancestor a,
* html #access ul li.current-menu-item a,
* html #access ul li.current-menu-parent a,
* html #access ul li a:hover {
color: #fff;
} */
Your problem will be solved.
Kind Regards