/sitemap.xml redirecting to /map.xml

Hi Everyone

Try this link and you'll see it: http://www.madesimplemedia.co.uk/sitemap.xml

What would cause this?  I'm really new to this so please assume I know nothing!

I'm running this web.config on the site:

[code]

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <rewrite>
        <rules>
                <rule name="Index.php" stopProcessing="true">
                    <match url="^site/?(.*)$" ignoreCase="false" />
                    <conditions logicalGrouping="MatchAll">
                        <add input="{THE_REQUEST}" pattern="^POST" ignoreCase="false" negate="true" />
                    </conditions>
                    <action type="Redirect" url="/{R:1}" redirectType="Permanent" />
                </rule>
                <rule name="File exception" stopProcessing="true">
                    <match url="^(.*)$" ignoreCase="false" />
                    <conditions logicalGrouping="MatchAll">
                        <add input="{REQUEST_FILENAME}" matchType="IsFile" ignoreCase="false" negate="true" />
                    </conditions>
                    <action type="Rewrite" url="/index.php/{R:1}" />
                </rule>
            </rules>
        </rewrite>
    </system.webServer>
</configuration>

[/code]