mysql_num_rows returning bad value

Question

I need help to solve a problem. I have this script twice on my page in two diffrent divs. The first script works fine and the second also, but when i run the script at the same time on the page only the first script works.When it work it returns 1 but now it returns 0.

The scripts is in diffrent files. One should be showning news category 4 and one news category 5.

Why doesnt it work?

Thankful for help.

<?php
$only = '';
if(isset($sc_categoryID) and $sc_categoryID) $only = "AND category='".$sc_categoryID."'";
if(isset($sc_rubricID) and $sc_rubricID) $only = "AND rubric='".$sc_rubricID."'";
if(isset($sc_game) and $sc_game) $only = "AND game='".$sc_game."'";


$ergebnis=safe_query("SELECT * FROM ".PREFIX."news WHERE published='1' ".$only." AND intern<=".isclanmember($userID)." AND category='4' ORDER BY date DESC LIMIT 0,".$maxheadlines);
if(mysql_num_rows($ergebnis)){
    echo '<ul>';
    $n=1;
    while($ds=mysql_fetch_array($ergebnis)) {
        $date=date("d.m.Y", $ds['date']);
        $time=date("H:i", $ds['date']);
        $news_id=$ds['newsID'];

        if($n%2) {
            $bg1=BG_1;
            $bg2=BG_2;
        }
        else {
            $bg1=BG_3;
            $bg2=BG_4;
        }

        if(file_exists('images/games/'.$ds['game'].'.gif')) $pic = '<img src="images/games/'.$ds['game'].'.gif" alt="'.$ds['game'].'" />';
        $game=$ds['game'];

        $category='';
        $newscategory=safe_query("SELECT categoryID, category FROM ".PREFIX."news_category WHERE categoryID='".$ds['category']."'");
        while($dr=mysql_fetch_array($newscategory)) {
            $categoryname=$dr['category'];
            $categoryname_link = getinput($categoryname);
        }

        $message_array = array();
        $query=safe_query("SELECT n.*, c.short AS `countryCode`, c.country FROM ".PREFIX."news_contents n LEFT JOIN ".PREFIX."countries c ON c.short = n.language WHERE n.newsID='".$ds['newsID']."'");
        while($qs = mysql_fetch_array($query)) {
            $message_array[] = array('lang' => $qs['language'], 'headline' => $qs['headline'], 'message' => $qs['content'], 'country'=> $qs['country'], 'countryShort' => $qs['countryCode']);
        }
        $showlang = select_language($message_array);

        $languages='';
        $i=0;
        foreach($message_array as $val) {
            if($showlang!=$i)   $languages.='<span style="padding-left:2px"><a href="index.php?site=news_comments&amp;newsID='.$ds['newsID'].'&amp;lang='.$val['lang'].'"><img src="images/flags/'.$val['countryShort'].'.gif" width="18" height="12" border="0" alt="'.$val['country'].'" /></a></span>';
            $i++;
        }

        $lang=$message_array[$showlang]['lang'];

        $headlines=$message_array[$showlang]['headline'];

        if(mb_strlen($headlines)>$maxheadlinechars) {
            $headlines=mb_substr($headlines, 0, $maxheadlinechars);
            $headlines.='...';
        }

        /* Comments - Mod */
        $comments = $_POST['comments'];
        if($ds['comments']) {
            if($ds['cwID']) {  // CLANWAR-NEWS
                $anzcomments = getanzcomments($ds['cwID'], 'cw');
                $replace = Array('$anzcomments', '$url', '$lastposter', '$lastdate');
                $vars = Array($anzcomments, 'index.php?site=clanwars_details&amp;cwID='.$ds['cwID'], clearfromtags(getlastcommentposter($ds['cwID'], 'cw')), date('d.m.Y - H:i', getlastcommentdate($ds['cwID'], 'cw')));

                switch($anzcomments) {
                case 0: $comments = str_replace($replace, $vars, $_language->module['no_comment']); break;
                case 1: $comments = str_replace($replace, $vars, $_language->module['comment']); break;
                default: $comments = str_replace($replace, $vars, $_language->module['comments']); break;
                }
            }
            else {
                $anzcomments = getanzcomments($ds['newsID'], 'ne');
                $replace = Array('$anzcomments', '$url', '$lastposter', '$lastdate');
                $vars = Array($anzcomments, 'index.php?site=news_comments&amp;newsID='.$ds['newsID'], clearfromtags(html_entity_decode(getlastcommentposter($ds['newsID'], 'ne'))), date('d.m.Y - H:i', getlastcommentdate($ds['newsID'], 'ne')));

                switch($anzcomments) {
                case 0: $comments = str_replace($replace, $vars, '0'); break;
                case 1: $comments = str_replace($replace, $vars, '1'); break;
                default: $comments = str_replace($replace, $vars, '$anzcomments'); break;
                }
            }
        }
        else $comments='Closed';

        /* End - Comments Mod*/

        $headlines=clearfromtags($headlines);

        if($ds['live'] == 1) $live = '<font style="text-decoration:blink; font-weight: bold; color:#009900;">*Live*</font>';
        else $live = '';

        eval ("\$sc_headlines = \"".gettemplate("sc_headlines")."\";");
        echo $sc_headlines;

        $n++;
    }
    echo '</ul>';
    unset($sc_rubricID);
    unset($sc_categoryID);
    unset($sc_game);
}
?>