DropDown列表在用户可以移动鼠标指针之前消失

I have a menu with list items Home and Home 2. When I hover my mouse over "Home"/"Home 2", the dropdown list appears for the item as expected. However, when I am moving my mouse down to the dropdown list, the list disappears immediately and I cant get access to the dropdown menu. I have a menu with list items Home and Home 2.