'CSS Menu Issue with using two dropdown sub sections

I am using an example of a responsive menu from w3c schools. This has single links and drop down links. I wished to replicate the drop section so have added a new section labelled dropdown 1. However when testing this setup on a mobile device it always randomly opens links from dropdown1 menu. Is this a bug or am I using the wrong approach for multi dropdown menus.

    function myFunction() {
      var x = document.getElementById("myTopnav");
      if (x.className === "topnav") {
        x.className += " responsive";
      } else {
        x.className = "topnav";
      }
    }

    body {margin:0;font-family:Arial}
    
    .topnav {
      overflow: hidden;
      background-color: #333;
    }
    
    .topnav a {
      float: left;
      display: block;
      color: #f2f2f2;
      text-align: center;
      padding: 14px 16px;
      text-decoration: none;
      font-size: 17px;
    }
    
    .active {
      background-color: #04AA6D;
      color: white;
    }
    
    .topnav .icon {
      display: none;
    }
    
    .dropdown {
      float: left;
      overflow: hidden;
    }
    
    .dropdown .dropbtn {
      font-size: 17px;    
      border: none;
      outline: none;
      color: white;
      padding: 14px 16px;
      background-color: inherit;
      font-family: inherit;
      margin: 0;
    }
    
    .dropdown-content {
      display: none;
      position: absolute;
      background-color: #f9f9f9;
      min-width: 160px;
      box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
      z-index: 1;
    }
    
    .dropdown-content a {
      float: none;
      color: black;
      padding: 12px 16px;
      text-decoration: none;
      display: block;
      text-align: left;
    }
    
    .topnav a:hover, .dropdown:hover .dropbtn {
      background-color: #555;
      color: white;
    }
    
    .dropdown-content a:hover {
      background-color: #ddd;
      color: black;
    }
    
    .dropdown:hover .dropdown-content {
      display: block;
    }
    
    @media screen and (max-width: 600px) {
      .topnav a:not(:first-child), .dropdown .dropbtn {
        display: none;
      }
      .topnav a.icon {
        float: right;
        display: block;
      }
    }
    
    @media screen and (max-width: 600px) {
      .topnav.responsive {position: relative;}
      .topnav.responsive .icon {
        position: absolute;
        right: 0;
        top: 0;
      }
      .topnav.responsive a {
        float: none;
        display: block;
        text-align: left;
      }
      .topnav.responsive .dropdown {float: none;}
      .topnav.responsive .dropdown-content {position: relative;}
      .topnav.responsive .dropdown .dropbtn {
        display: block;
        width: 100%;
        text-align: left;
      }
    }

<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet"/>
    <body>
    <div class="topnav" id="myTopnav">
      <a href="#home" class="active">Home</a>
      <a href="#news">News</a>
    x
        
        <div class="dropdown">
        <button class="dropbtn">Dropdown 
          <i class="fa fa-caret-down"></i>
        </button>
        <div class="dropdown-content">
          <a href="1.php">Link 1</a>
          <a href="1.php">Link 2</a>
          <a href="1.php">Link 3</a>
        </div>
      </div> 
        
      <a href="#contact">Contact</a>    
        
        <div class="dropdown">
        <button class="dropbtn">Dropdown 1
          <i class="fa fa-caret-down"></i>
        </button>
        <div class="dropdown-content">
          <a href="1.php">Link 1</a>
          <a href="1.php">Link 2</a>
          <a href="1.php">Link 3</a>
        </div>
      </div>    
        
      <a href="#about">About</a>
      <a href="javascript:void(0);" style="font-size:15px;" class="icon" onclick="myFunction()">&#9776;</a>
    </div>
    <div style="padding-left:16px">
      <h2>Responsive Topnav with Dropdown</h2>
      <p>Resize the browser window to see how it works.</p>
      <p>Hover over the dropdown button to open the dropdown menu.</p>
    </div>
    </body>

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'CSS Menu Issue with using two dropdown sub sections

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