Oh, I see what you mean now... I was getting confused thinking it was something else. I fixed it for the next version, but for now if you go into the "Insert Inside & After Current Post" plug-in, change this:
Code:
$template_hook['postbit_end'] = $vbulletin->options['dppa_afterpost_html'];
to this:
Code:
$template_hook['postbit_end'] .= $vbulletin->options['dppa_afterpost_html'];
Adding the one period will make it append to vs. overwrite anything else using that template hook location.