[Rails] form_for Values Are Not Visible

I'm using this form in an edit page to update a person. For some weird reason, when I view this form in the browser... The text field's value is set to the person's firstname, but it does not display in the browser.

The form works perfectly on Windows (the values are visible in the browser), but not on Ubuntu Linux. I'm using the same environment setup; same Ruby, Rails, and gems versions..

<% form_for @person do |f| %>
    <label for="person_firstname">First Name</label> <%= text_field :person, :firstname, :class => "textbox", :size => "30%" %>
    <br />
    <%= submit_tag "Update Person", :class => "button button-right" %>
<% end %>

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Joshua S. Martin

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