为什么我的导航栏在移动设备上缩放页面？

#NavigationBarList{
list-style-type:none;
padding:0;
}

li{
font-size:130%;
}

nav a{
display:block;
}

/* This customizes the presentation of the list elements (menu items) in the navbar. */
nav li{
display:block;
font-weight:bold;
font-size:200%;
color:#7F1717;
background-color:#9E939E;
width:25%;
text-align:center;
text-decoration:none;
text-transform:uppercase;
z-index:11;
-moz-box-shadow:    inset 0 0 1px #000000;
-webkit-box-shadow: inset 0 0 1px #000000;
box-shadow:         inset 0 0 1px #000000;
}

nav ul{
width:100%;
}

/* Hide the sub menu items. */
nav ul ul {
display:none;
}

nav ul ul ul {
display:none
}

/* When hovered over, the CSS menu will drop down. */
nav li:hover > ul {
text-align:center;
font-size:40%;
display:block;
}

/* Don't underline links in the list elements (menu items). */
ul a {
text-decoration:none;
color:#7F1717;
}

/* Change the background color of hovered list elements. This was both active and hover... */
nav li:hover{
background-color:#625C62;
}

/* This customizes the ul elements in the sub-menu. */
nav ul ul{
position:absolute;
padding:0;
width:100%
}

nav ul ul ul{
position: absolute;
width:400%;
left:100%;
top:0;
}

#totheleft{
left:-100%;
}

nav ul ul ul li{
text-align:center;
font-size:250%;
}

/* I think this refers to the dropdown navbar location and properties. */
nav ul ul li {
position:relative;
}

<nav>
  <ul id="NavigationBarList">
    <li style="float:left;">Events
    <ul>
	  <li><a href="tournaments.html">Tournaments</a></li>
	  <li><a href="kids_hour.html">Kid's Hour</a></li>
	  <li><a href="calendar.html">Local Calendar</a></li>
	</ul>
	</li>
	<li style="float:left;">Programs
	<ul>
	  <li><a href="summer_camps.html">Summer Camps</a></li>
	  <li>In Schools
	  <ul>
		<li><a href="schools.html">After School</a></li>
		<li><a href="school_registration.html">Registration</a></li>
	  </ul>
	  </li>
	  <li><a href="instructors.html">Local Instructors</a></li>
	</ul>
	</li>
	<li style="float:left;">Content
	<ul>
	  <li><a href="posts.html">Posts</a></li>
	  <li><a href="games.html">Games</a>
	</ul>
	</li>
    </li>
	<li style="float:left;">Connect
	<ul>
	  <li><a href="contact.html">Contact Us</a></li>
	  <li>Resources
	  <ul id="totheleft">
	    <li><a href="links.html">Chess</a></li>
	    <li><a href="go_links.html">Go</a></li>
	    <li><a href="xiangqi_links.html">Xiangqi</a></li>
		<li><a href="shogi_links.html">Shogi</a></li>
	    <li><a href="backgammon_links.html">Backgammon</a></li>
	  </ul>
	  </li>
	  <li><a href="about us.html">About Us</a></li>
	</ul>
    </li>
  </ul>
</nav>