Dropdown menu per kilometer, how to fix?

Question

User navigation

Good day. In general, I made a drop-down menu, it opens, but ... In general, it turns out in a different block.

html

<nav class="header__top-nav" id="navLinks">
            <ul>
            <li><a href="#" class="header__top-nav-link">меню</a>
              <ul>
                <li><a href="#">123</a></li>
            </ul>

          </li>

css

ul{
  display: flex;
}

ul ul{
    display: none;
    position: absolute;
    top: 100%;
}

nav ul li:hover > ul {
    display:inherit;
}

 ul ul li {
    min-width:170px;
    float:none;
    display:list-item;
    position: relative;
}

Answer 1

I decided. removed in css
top: 100%;