BootStrap模态框闪退问题

BootStrap模态框闪退问题

模态框闪退到你还看不到模态框的内容呢，就屏幕灰了一下就是
代码如下

<!--搜索注册条-->
<div class="container-fluid">
<form class="navbar-form navbar-center" role="Search">
<div class="form-group text-center col-sm-4">
<input type="text" class="form-control" placeholder="Search">
<span class="input-group-addon">搜索</span>
</div>
<div class="container">
<button type="submit" class="btn-info">登录</button>
<button type="button" class="btn-danger">注销</button>
<button class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal" >注册</button>
<!--注册的模态框-->
<div class="modal fade" id="myModal">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal">&times;</button>
<h4 class="modal-title">注册</h4>
</div>
<div class="modal-body">
<div class="container">
<div class="input-group">
<label>手机号</label>
<input type="text" class="form-control" placeholder="请输入您的手机号" />
</div>
<div class="input-group">
<label>姓名</label>
<input type="text" class="form-control" placeholder="请输入您的姓名" />
</div>
<div class="input-group">
<label>邮箱</label>
<input class="text" class="form-control" placeholder="请输入您的邮箱" />
<span class="input-group-addon">@qq.com</span>
</div>
<div class="input-group">
<label>性别</label>
<label class="radio-inline"><input class="radio" />男&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</label>
<label class="radio-inline"><input class="radio" />女&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</label>
</div>
<div class="input-group">
<div class="progress">
<div class="progress-bar" style="width: 50px;">
<span class="sr-only">注册信息提交中......</span>
</div>
</div>
</div><!--body部分-->
<div class="modal-footer">
<button class="btn btn-primary">提交</button>
<button class="btn btn-default" data-dismiss="modal">关闭</button>
</div>
</div>
</div>
</div>
<!--注册的模态框-->
</div>
</form>
<!--搜索注册条-->
</div>

最后把form改成nav就好了，但模态框的排版出现了问题