I spotted this in the xml file at the bottom
Code:
<phrase name="slap_toplist"><![CDATA[Top Slappers]]></phrase>
So now what you need to check just to be certain is that if you have the phrase "slap_toplist" in your phrase manager. If you DO NOT somehow have it then perhaps that may be a problem, hence the root cause for the toplist not showing.
Though I have my doubts because once you upload the xml file it does everything for you, but no harm in checking to be certain

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I am not a coder, unfortunately so I can only help you with assumptions, who knows maybe I might stumble across something that actually fixes the problem? nevertheless do check the phrase.
Good Luck