Eri
To resolve replace the following in your templates index.php (../templates/j51_lifestyle/index.php)...
<li class="social-delicious"><a href="/<?php echo $this->params->get('social_delicious'); ?>" target="_blank" title="Delicious"></a></li>
With...
<li class="social-delicious"><a href="/<?php echo $this->params->get('social_delicious'); ?>" target="_blank" title="Issuu"></a></li>
Ciarán