图片为什么一下跳两张的距？我明明设置是一张的距离啊？

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			*{margin:0;padding:0;text-decoration:none;}
			body{padding:20px}
			#container{width:600px;height:400px;border:3px solid #333;overflow:hidden;position:relative;margin:0 auto;}
			#list{width:4200px;height:400px;position:absolute;z-index:1;}
			#list img{float:left;}
			#buttons{position:absolute;width:100px;height:10px;bottom:20px;left:250px;z-index:2;}
			#buttons span{cursor:pointer;display:block;float:left;width:10px;height:10px;border:1px solid #FFF;border-radius:50%;background:#333;margin-right:5px;}
			#buttons .on {  background: orange;}
			.arrow{position:absolute;display:none;width:40px;height:40px;line-height:40px;z-index:2;font-size:36px;text-align:center;font-weight:bold;top:180px;background-color:rgba(0,0,0,.3);color:#FFF;}
			
			#prev{left:20px;}
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			#container:hover .arrow{display:block;}
			.arrow:hover{background-color:rgba(0,0,0,.7);}
			
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	</head>
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		<div id="container">
			<div id="list" style="left:-600px">
				<img src="img/5.jpg" alt="" title="">
				<img src="img/1.jpg" alt="" title="">
				<img src="img/2.jpg" alt="" title="">
				<img src="img/3.jpg" alt="" title="">
				<img src="img/4.jpg" alt="" title="">
				<img src="img/5.jpg" alt="" title="">
				<img src="img/1.jpg" alt="" title="">
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​图片为什么一下跳两张的距？我明明设置是一张的距离啊？

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图片为什么一下跳两张的距？我明明设置是一张的距离啊？