Some People Lists will omit the first individual when exporting to labels.
Use the L1000 Core Sheet Labels report to get labels to print correctly using the People List or Group.
Updated
<% if (previousArticle) { %>
<% } %>
<% if (allItems.length > 1) { %>
<% if (previousTitle) { %>
<% } %>
<% if (nextArticle) { %>
<%= previousTitle %>
<% } %> <%= previousArticle.title %>
<% if (nextTitle) { %>
<% } %>