Custom Field Type Display Issue

I am creating a custom field type in SharePoint 2013 that is inherited from the SPFieldUser field.  I am overriding the default value so that the user's manager is defaulted in automatically.  Everything works fine on the new, edit, and display forms but I can't get it to format correctly on the list views.  The html is being rendered as text instead of html on the page.  I copied the RenderPatterns from the SPFieldUser control but that didn't seem to make any difference in how it was being rendered.
Is there something else I could be missing or has anyone seen this before?