I cant get the search navigation webpart displayed

Question

I have injected the key search webparts within a dedicated page. I added all webparts to mimic what's available in a enterprise search center.

All webparts are displayed beside the navigation webpart that should display People, eve rything, converstations, videos.

what can cause the problem?

This is the webpart I am using:

<AllUsersWebPart WebPartZoneID="MainZone" WebPartOrder="2">
        <![CDATA[
      <?xml version="1.0" encoding="utf-8"?>
      <webParts>
  <webPart xmlns="http://schemas.microsoft.com/WebPart/v3">
    <metaData>
      <type name="Microsoft.Office.Server.Search.WebControls.SearchNavigationWebPart, Microsoft.Office.Server.Search, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" />
      <importErrorMessage>Cannot import this Web Part.</importErrorMessage>
    </metaData>
    <data>
      <properties>
        <property name="QueryGroupName" type="string">Default</property>
        <property name="AllowZoneChange" type="bool">True</property>
        <property name="HelpUrl" type="string" />
        <property name="Hidden" type="bool">False</property>
        <property name="MissingAssembly" type="string">Cannot import this Web Part.</property>
        <property name="Description" type="string">This webpart helps the users to navigate among search verticals</property>
        <property name="MaxLinksBeforeOverflow" type="int">5</property>
        <property name="AllowHide" type="bool">True</property>
        <property name="AllowMinimize" type="bool">True</property>
        <property name="Title" type="string">Search Navigation</property>
        <property name="TitleUrl" type="string" />
        <property name="ExportMode" type="exportmode">All</property>
        <property name="ChromeType" type="chrometype">None</property>
        <property name="AllowConnect" type="bool">True</property>
        <property name="Width" type="string" />
        <property name="Height" type="string" />
        <property name="CatalogIconImageUrl" type="string" />
        <property name="HelpMode" type="helpmode">Modeless</property>
        <property name="AllowEdit" type="bool">True</property>
        <property name="TitleIconImageUrl" type="string" />
        <property name="Direction" type="direction">NotSet</property>
        <property name="AllowClose" type="bool">True</property>
        <property name="ChromeState" type="chromestate">Normal</property>
      </properties>
    </data>
  </webPart>
</webParts>
      ]]>
      </AllUsersWebPart>

note: the webpart gets activated on the page but there is no text (People, Everything, videos etc). I have also activated the enterprise features