Sub Menu Disappearing

I have been building this site https://www.wrc.org/wordpress. Today while showing the site to someone on their computer, which is running Internet Explorer 10, I noticed the submenu under Services that pops up when you hover over Laurelbrooke Landing kept disappearing before you could click on it. However it works fine on my computer when I checked it in IE10.

I had trouble with my menus appearing in different places depending on the browser and only showing partial menus, and a kind soul on here told me to put this in my Custom CSS box in my theme.

#navi {
 *clear: left;
 *width: 100%;
 *float: none;
}

#nav li ul ul {
 *margin-left: 0;
 *left: 12em;
}
#nav li ul {
 *top: 40px;

That fixed those issues and I’m hoping someone will know what I can add to fix this one.