Line breaks being inserted into HTML tables when printing

I have a PHP script that runs a for loop and echo's out HTML Table rows and data. However I get random occurrences where a line break is inserted into a table row when I do print/print preview and I don't know why. It seems to render everything in the browser perfectly though... Take a look at the screenshot of the print preview below for row 7. I tried specifying height to 0

Here's the code I'm using in PHP:

$counter = 1;   
$tCounter = 1;  
$pCounter = 1;
$tc=9;
for($i=0; $i<count($spiceType); $i++){
    $result = mysql_query("SELECT * FROM `spices` WHERE `type`='$spiceType[$i]' ORDER BY ID")or die(mysql_error());
    $spiceCat = $spiceType[$i];
    echo '<tr>
            <td colspan="6" ><p class="cat" >'.$spiceCat.'</p>开发者_JS百科</td>
          <tr>';


    while($r=mysql_fetch_array($result)){
        $pname = $r[productName];
        $qty = $r[qty];
        $price = $r[price];
        $upcNum = $r[upcNumber];
        $imageName = substr($upcNum, 0, -1);
        $imageName = "0".$imageName.".jpg";
        echo'
            <tr height="0">
                <td width="25"><p class="counter">'.$counter.'</counter></td>
                <td width="200"><p class="productName"><a href="edit.php?upc='.$upcNum.'&pn='.$pname.'" class="links" name="'.$pname.'">'.$pname.'</a></p></td>
                <td width="50"><p class="qty">'.$qty.'</p></td>
                <td width="100"><p class="price">'.$price.'</p></td>
                <td width="25"><p class="upc">'.$upcNum.'</p></td>
                <td width="50" align="center"><img src="upcjpeg/'.$imageName.'" style="width: 85%; height: inherit; vertical-align:text-top"></td>
            <tr>';
        if($tCounter==$tc){
            $tCounter=1;
            $tc=11;

            echo'
                </table>
                <p align="right">Page: '.$pCounter.'
                <div class="page-break"></div>
                <table width="1024" class="sample">
                    <tr border="0" cellpadding="0">
                        <th width="25"><h2><p align="center">#</p></h2></th>
                        <th width="200"><h2><p align="center">Product Name</p></h2></th>
                        <th width="50"><h2><p align="center">Qty</p><h2></th>
                        <th width="100"><h2><p align="center">Price</p><h2></th>
                        <th width="25"><h2><p align="center">UPC No.</p><h2></th>
                        <th width="50"><h2><p align="center">Barcode</p><h2></th>
                    </tr>
                    <tr>
                        <td colspan="6" bgcolor=#E0E0E0><p class="catCont">'.$spiceCat.'(cont.)</p></td>
                    <tr>';
            $pCounter++;
        } else {
            $tCounter++;
        }
        $counter++;

    }
}