Magento 2 Custom Module - Product Selector

Question

I wonder if you can help me out. I've just created a customer Ajax module for a product selector.

It's been working fine locally, I've just pushed it LIVE and unfortunatley it's now stopped working.

Here is the code:

$result = $this->resultRawFactory->create();

$collection = $this->_productCollectionFactory->create();
$collection->addAttributeToSelect('*');

//Get filter values.
$categoryData = $this->getRequest()->getParam('whoisitfor');
if($categoryData) {
    $categoryData = $this->implodeFormValues($categoryData);
}
$userExperienceLevel = $this->getRequest()->getParam('user_experience_level');
$userDesiredPleasure = $this->getRequest()->getParam('desired_pleasure');
$userVibrating = $this->getRequest()->getParam('vibrating');
$userPowerSource = $this->getRequest()->getParam('power_source');
$userPrice = $this->getRequest()->getParam('price');


// Get category selected.
if(isset($categoryData)) {
    $categoryData = $this->expandFormValues($categoryData);
    $categories = [$categoryData];//category ids array
    $collection->addCategoriesFilter(['in' => $categories]);
}

// Filter on Experience
if(isset($userExperienceLevel)) {
    foreach($userExperienceLevel as $item) {
        $collection->addFieldToFilter('user_experience_level', array(
            array('finset' => array($item)),
        ));
    }
}

// Filter on Desired pleasure
if(isset($userDesiredPleasure)) {
    foreach($userDesiredPleasure as $item) {
        $collection->addFieldToFilter('desired_pleasure', array(
            array('finset' => array($item)),
        ));
    }
}

// Filter on Vibrating
if(isset($userVibrating)) {
    foreach($userVibrating as $item) {
        $collection->addFieldToFilter('vibrating', array(
            array('finset' => array($item)),
        ));
    }
}

// Filter on Power Source
if(isset($userPowerSource)) {
    foreach($userPowerSource as $item) {
        $collection->addFieldToFilter('power_source', array(
            array('finset' => array($item)),
        ));
    }
}

$_objectManager = \Magento\Framework\App\ObjectManager::getInstance(); //instance of\Magento\Framework\App\ObjectManager
$storeManager = $_objectManager->get('Magento\Store\Model\StoreManagerInterface');
$currentStore = $storeManager->getStore();

$mediaUrl = $currentStore->getBaseUrl(\Magento\Framework\UrlInterface::URL_TYPE_MEDIA);

$html = '<div class="row">';
foreach ($collection as $item) {
    $html .= '<div class="col-xs-12 col-sm-6 col-md-3">';
        $html .= '<div class="product-filter-block">';
            $html .= '<a href="'.$item->getProductUrl().'">';
                $html .= '<img src="'.$mediaUrl.'catalog/product'.$item->getThumbnail().'" />';
            $html .= '</a>';
            $html .= '<div class="product-filter-data row">';
                $html .= '<div class="product-filter-title col-xs-12"><h1>'.substr($item['name'], 0, 50).'</h1></div>';
                $html .= '<div class="product-filter-price col-xs-12">£'.number_format($item->getPrice(), 2).'</div>';
                $html .= '<div class="product-filter-view col-xs-12"><a href="'.$item->getProductUrl().'"><button>View Product</button></a></div>';
            $html .= '</div>';
        $html .= '</div>';
    $html .= '</div>';
}
$html .= '</div>';

$result->setContents($html);

return $result;

Like I said it's been working fine.

Filtering by category is still working but when you select a custom attribute it doesn't filter any further.

Any ideas?