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Hi
Thanks for details, The problem was from the template you are using, it has wrong code to display the plugin.
I cut this code from line 60
"/html/com_content/article/default.php" in template "hipster".
<?php echo $this->item->event->afterDisplayContent; ?>
and pasted it after line225
You can see now its showing fine.
You can contact to the template provider to report this issue as well.
Regards