How to remove the caption in gallery caption module?
You can copy file galleryformatter.tpl.php from Gallery formatter module to your folder theme. And remove some code line 28->35

&lt;?php if (!empty($data['title']) || !empty($data['alt'])): ?&gt;
            &lt;div class="panel-overlay"&gt;
              &lt;div class="overlay-inner"&gt;
                &lt;?php if ($data['alt']): ?&gt;&lt;h4&gt;&lt;?php print $data['alt']; ?&gt;&lt;/h4&gt;&lt;?php endif; ?&gt;
                &lt;?php if ($data['title']): ?&gt;&lt;h3&gt;&lt;?php print $data['title']; ?&gt;&lt;/h3&gt;&lt;?php endif; ?&gt;
              &lt;/div&gt;
            &lt;/div&gt;
          &lt;?php endif; ?&gt;


And clear cache.