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為什么按照例子又寫了一個菜單之后，第一個菜單下拉的位置錯了

<!DOCTYPE?HTML>
<html>
<head>
<meta?http-equiv="Content-Type"?content="text/html;?charset=utf-8">
<title>下拉菜單</title>
<link?rel="stylesheet"?>
<link?rel="stylesheet"?href="style.css">
</head>
<body>

?<div?class="dropdown">
??<button?class="btn?btn-default?dropdown-toggle"?type="button"?id="dropdownMenu1"?data-toggle="dropdown">
????下拉菜單
????<span?class="caret"></span>
??</button>
??<ul?class="dropdown-menu"?role="menu"?aria-labelledby="dropdownMenu1">
????<li?role="presentation"><a?role="menuitem"?tabindex="-1"?href="#">下拉菜單項</a></li>
????<li?role="presentation"><a?role="menuitem"?tabindex="-1"?href="#">下拉菜單項</a></li>
????<li?role="presentation"><a?role="menuitem"?tabindex="-1"?href="#">下拉菜單項</a></li>
????<li?role="presentation"><a?role="menuitem"?tabindex="-1"?href="#">下拉菜單項</a></li>
??</ul>
<br/><br/>
??<div?class="dropdown">
??????<button?class="btn?btn-default?dropdown-toggle"?type="button"?id="dropdownMenu2"?data-toggle="dropdown">
??????????選擇你最喜歡的水果
??????????<span?class="caret"></span>
??????</button>
??????<ul?class="dropdown-menu"?role="menu"?aria-labelledby="dropdownMenu2">
??????????<li?role="presentation"><a?role="menuitem"?tabindex="-1"?href="#">蘋果</a></li>
??????????<li?role="presentation"><a?role="menuitem"?tabindex="-1"?href="#">香蕉</a></li>
??????????<li?role="presentation"><a?role="menuitem"?tabindex="-1"?href="#">梨</a></li>
??????????<li?role="presentation"><a?role="menuitem"?tabindex="-1"?href="#">桃</a></li>
??????</ul>
??</div>
</div>?
??<script?src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script>
??<script?src="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>?
</body>
</html>