Joomla 3.0 modules.php and static variables - caching error

<?php
defined('_JEXEC') or die;
### Joomla Template - Workframe
### www.joomla-agentur.de
?>
<?php
function modChrome_jooag( $module, &$params, &$attribs ){
    //Variablen die benötigt werden
    $doc = JFactory::getDocument();
    $modCountSum = $doc->countModules($attribs['name']);
    $modPosition = $module->position;//$module -> id title name
    $modPerRow = $doc->params->get('modulesPerRow');
    $spanCustom = '';
    $spanOffset = '';
    //Variablen die innerhalb der Funktion gespeichert werden müssen
    static $modCount;
    static $spanMatrix;
    $modCount++;
    //Titel nach [modus_xx] Filtern
    if($modCount == 1){$spanMatrix = array();}
    preg_match_all("/^(.*\[)(.*)(\])/", $module->title, $betweenBrackets);

    if(isset($betweenBrackets[2][0])== false){$betweenBrackets = array ( "2"  => array("0" => ' [empty] '));}

    $titleSuffix = explode('|',$betweenBrackets[2][0]);
    foreach($titleSuffix as $options){
        if(preg_match('/preset/',$options) and $modCount == 1){
            $titleGridResult = explode("_",$options);
            $moduleMode = $titleGridResult[0];
            $modGrids = $titleGridResult[1];
        }
        if(preg_match('/span/',$options)){
            $spanCustom = $options;
        }
        if(preg_match('/offset/',$options)){
            $spanOffset = $options;
        }
    }

    if($modCount == 1){
        //Modulaufteilung nach Anzahl
        if($modCountSum > $modPerRow){$newModulesPerRow = $modPerRow;}
        if($modCountSum <= $modPerRow || $modPerRow == 0){$newModulesPerRow = $modCountSum;}

        for($i=1; $i <= $modCountSum; $i++){
            $spanMatrix[$modPosition][$i] = 12 / $newModulesPerRow;
        }
        //Left & Right Calculating
        if($modPosition == 'left' || $modPosition == 'right'){
            for($i=1; $i <= $modCountSum; $i++){
                $spanMatrix[$modPosition][$i] = $doc->params->get($modPosition.'Span');
            }
        }
        //Mode: Preset
        if(isset($moduleMode)){
            $mG = $modGrids.',';
            $modGrids = explode(",",'0,'.$mG.$mG.$mG.$mG.$mG.$mG.$mG.$mG.$mG.$mG.$mG.$mG.$mG.$mG.$mG.$mG.$mG.$mG.$mG.$mG.$mG.$mG.$mG.$mG.$mG);
            for($i=1; $i <= 12; $i++){
                $spanMatrix[$modPosition][$i] = $modGrids[$i];
            }
        }
        //Abrunden
        for($i=1; $i <= $modCountSum; $i++){
            $spanMatrix[$modPosition][$i] = ceil($spanMatrix["$modPosition"][$i]);
        }
    }
    //Module Mode Detection for the reft and right module
    $modDef = array('left','right');

    //AUSGABE MODULE - ALL
    if($modCount == 1 and in_array($modPosition, $modDef) == false){echo '<div class="row'.jooagFluid().' '.$modPosition.'-section">';}
            echo '<div class="span'.$spanMatrix[$modPosition][$modCount].' '.$modPosition.' id'.$modCount.' module '.$params->get('moduleclass_sfx').' '.$spanCustom.' '.$spanOffset.'">';
                if ($module->showtitle){echo '<h4 class="titlestyle"><i></i>'.preg_replace('/\[(.*)\]/','',$module->title).'</h4>';}
                echo $module->content;
            echo '</div>';
        if($modCount == $modCountSum and in_array($modPosition, $modDef) == false){$modCount = 0;echo '</div>';}
        if(in_array($modPosition, $modDef)){$modCount = 0;}


    //NEW row Detection
    $spanSum = '';
    for($i=1; $i <= $modCount; $i++){$spanSum = $spanSum + $spanMatrix[$modPosition][$i];}
    if(($modCount) % 12 == 0 and $modCount != 0){echo '/div><div class="row'.jooagFluid().' '.$modPosition.'-section">';}
}
?>