Кароче так оно работать не будет, нужно еще в строке: убрать active
<div class="tab-pane active" id="tab-description" itemprop="description"><?php echo $description; ?></div>
<?php foreach($tab_info as $info){ ?>
<div class="tab-pane" id="tab-extratab<?php echo $info['tab_id']; ?>"><?php echo $info['description']; ?></div>
<?php } ?>
<?php foreach($product_tabs as $key => $tab){ ?>
а в строчке добавить active
<div class="tab-pane active" id="tab-specification">
<?php if ($atributs_group_name) { ?>
<?php foreach ($attribute_groups as $attribute_group) { ?>
<table class="table attrbutes mb0">
<thead>
<tr>
<td colspan="2"><?php echo $attribute_group['name']; ?></td>
</tr>
</thead>
<tbody>
<?php foreach ($attribute_group['attribute'] as $attribute) { ?>
<tr itemprop="additionalProperty" itemscope itemtype="http://schema.org/PropertyValue">
<td itemprop="name"><?php echo $attribute['name']; ?></td>
<td itemprop="value"><?php echo $attribute['text']; ?></td>
</tr>
<?php } ?>