如何解决使用Material Design引导程序-使用表单按钮，我看到一个奇怪的下拉菜单问题
在使用Material Design Bootstrap时，我看到有关使用下拉菜单的怪异问题。当我不使用“材料设计”时，下拉菜单显示为正常大小：
但是当使用材质设计时，它会使菜单很大，但是仅当我使用表单控件（请参见代码）注销用户时：
有人可以帮我弄清楚我在做什么错吗？
非常感谢
吉姆
_layout.cshtml的代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width,initial-scale=1.0" />
<title>@ViewData["Title"] - Test Site</title>
<!-- Font Awesome -->
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.8.2/css/all.css">
<!-- Google Fonts -->
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700&display=swap">
<!-- Bootstrap core CSS -->
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.5.0/css/bootstrap.min.css" rel="stylesheet">
<!-- Material Design Bootstrap -->
@*<link href="https://cdnjs.cloudflare.com/ajax/libs/mdbootstrap/4.19.0/css/mdb.min.css" rel="stylesheet">*@
<!--Site CSS-->
<link rel="stylesheet" href="~/css/site.css">
</head>
<body>
<header>
<!--Navbar -->
<nav class="mb-1 navbar navbar-expand-lg navbar-dark default-color">
<a class="navbar-brand" href="#">Test Site</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent-333"
aria-controls="navbarSupportedContent-333" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent-333">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="#">
Home
<span class="sr-only">(current)</span>
</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Features</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Pricing</a>
</li>
</ul>
<ul class="navbar-nav ml-auto nav-flex-icons">
<li class="nav-item">
<a class="nav-link waves-effect waves-light">
<i class="fab fa-twitter"></i>
</a>
</li>
<li class="nav-item">
<a class="nav-link waves-effect waves-light">
<i class="fab fa-facebook"></i>
</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" id="navbarDropdownMenuLink-333" data-toggle="dropdown"
aria-haspopup="true" aria-expanded="false">
<i class="fas fa-user"></i>
</a>
<div class="dropdown-menu dropdown-menu-right dropdown-primary" aria-labelledby="navbarDropdownMenuLink-333">
<partial name="_LoginPartial" />
</div>
</li>
</ul>
</div>
</nav>
<!--/.Navbar -->
</header>
<div class="container-fluid">
<main role="main" class="pb-3">
@RenderBody()
</main>
</div>
<script async defer src="https://maps.googleapis.com/maps/api/js?key=key&libraries=places"></script>
<!-- JQuery -->
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<!-- Bootstrap tooltips -->
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.4/umd/popper.min.js"></script>
<!-- Bootstrap core JavaScript -->
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.5.0/js/bootstrap.min.js"></script>
<!-- MDB core JavaScript -->
@*<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mdbootstrap/4.19.1/js/mdb.min.js"></script>*@
@*<script src="~/js/site.js" asp-append-version="true"></script>*@
@RenderSection("Scripts",required: false)
</body>
</html>_loginPartial.shtml的代码：
@if (SignInManager.IsSignedIn(User))
{
<a class="dropdown-item" asp-area="Identity" asp-page="/Account/Manage/Index" title="Manage"><i class="fas fa-user"></i> Settings</a>
<div class="dropdown-divider"></div>
<form asp-area="Identity" asp-page="/Account/Logout" asp-route-returnUrl="@Url.Action("Index","Home",new { area = "" })">
<button type="submit">Logout</button>
</form>
}
else
{
<a class="dropdown-item" asp-area="Identity" asp-page="/Account/Register">Register</a>
<a class="dropdown-item" asp-area="Identity" asp-page="/Account/Login">Login</a>
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