Referenced entity with multiple values making duplicate rows in views
What helped is going custom code. Instead of relying on the fields that would have come out of the Views query, I grabbed the nid of my referenced field of my 'event' content type and loaded the rest of the fields via node_load();. All of this happening in a tpl file views-view-fields--viewnale--block.tpl.php

I used the row object and made a loop that went over the multiple valued referenced entity. 

    &lt;?php foreach($row-&gt;field_field_evenement_performer_1 as $key =&gt; $whatever): ?&gt;
    &lt;?php $performer = node_load($row-&gt;field_field_evenement_performer_1[$key]['raw']['target_id']);


    $title = $performer-&gt;title;
    $picture = $performer-&gt;field_performer_foto['und'][0]['uri'];   
    $bio = $performer-&gt;body['und'][0]['value'];  

    print '&lt;div class=\'forModal\'&gt;&lt;h3&gt;' . $title . '&lt;/h3&gt;&lt;/div&gt;';
    print '&lt;div class=\'forModal\'&gt;&lt;img src="' . $picture . '"/&gt;&lt;/div&gt;';
    print '&lt;div class=\'forModal\'&gt;' . $bio . '&lt;/div&gt;'; ?&gt;

&lt;?php endforeach ?&gt;