Widget plugin bad character encoding

I am trying to help a friend with a widget coding problem. The plugin is Ibcx wizard & causes this in the widget html:

<div class="art-BlockContent-body">
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This displays on the site as can be seen at the site:
exploreinternetmarketingonline

The way the ibcx plugin should display can be seen at my wordpress theme test site:onlinewpthemetest

Anyone any idea what might be causing this bad character encoding?
I appreciate & look forward to helpful replies, thanks