The controls are probably not properly attached to the frame. Remove them and reattach them. Attach the top first, then the bottom.
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<% if (previousArticle) { %>
<% } %>
<% if (previousTitle) { %>
<% } %>
<% if (nextArticle) { %>
<%= previousTitle %>
<% } %> <%= previousArticle.title %>
<% if (nextTitle) { %>
<% } %>