ทำไมผมดึงข้อมูลจากดาต้าเบสมาโชว์แบบแถว พอใส่แบ่งหน้า หน้าต่อไปมันแสดงรูปไม่เท่ากัน ช่องมันถึงเลื่อนอ่ะครับ

<?php
	if(!isset($start))
	{
	$start = 0;
	}
	
        $limit = 4;
							
	$total = mysql_query("select * from photo where title_id = '$id_title'"); 
	$total_rows = mysql_num_rows($total); 
							
	$showphoto = "select * from photo where title_id = '$id_title' order by photo_id asc limit $start,$limit";
	$runshowphoto = mysql_query($showphoto) or die ("not run showphoto");			
	$num_photo = mysql_num_rows($runshowphoto);
							
		if($num_photo>0)
		{
		echo "<table width='720' border='0' cellpadding='0' cellspacing='0' class='TM14n'>";
			
			$check = 1;
			while($showpt = mysql_fetch_array($runshowphoto))
			{
			$photo_id = $showpt['photo_id'];
			$photo_pic = $showpt['photo_pic'];
									
			        if($photo_pic!="")
			        {
				        $showphoto1 = "select * from photo where title_id = '$id_title'";
					$runshowphoto1 = mysql_query($showphoto1) or die ("not run showphoto1");			
					$num_photo1 = mysql_num_rows($runshowphoto1);
					$width =120; // กำหนดขนาดความกว้าง
					$height = 120;
					$size = getimagesize("salaya_ad/images/photoalbum/".$photo_pic); // เช็คค่าสูง กว้าง
					$sizew = $size[0];
					$sizeh = $size[1];	

					if($sizeh>$sizew)
					{
						$height = round(($width*$sizeh)/$sizew);
					}
					else
					{
						$width = round(($height *$sizew)/$sizeh);
					}
				}
							
				if($check%4==1)
				{
					echo "<tr>";
				}

				echo "

				<td width='180' align ='center'  valign='middle' class='TM14n'>
                                    <table border='0' cellpadding='0' cellspacing='0' class='TM14n'>
                                      <tr>
                                        <td align ='center' valign='middle'><div style='padding:4px; border:solid 1px #979797; white-space:normal; width:120px; overflow:hidden; background-color:#c1c1c1;'><a href='viewphoto.php?id_photo=$photo_id' target='_blank'><div align='center' style='white-space:normal; width:120px; height:120px; overflow:hidden;'><img src='salaya_ad/images/photoalbum/$photo_pic' width='$width' height='$height' border='0'></div></a></div></td>
                                      </tr>
				      <tr><td class='TM14n'>&nbsp;</td></tr></table></td>";
                                    
				if($check%4==0)
				{
					echo "</tr>";
					$check = 0;
				}
				$check++;
			}
			echo "</table>";
		}
?>