[Xitami] RE:FTP , data mode not working

[d calif]

Reviewing the Xitami docs. in FTP section:
""data-port
    Specifies the port at which data connections will be made. Xitami scans 
for free ports, so this is simply the start of a range of ports. The port is 
shifted by whatever value was used for the server portbase.
    Default: 200.""

In my previous post, I said I opened ports 8020 and 8021.  The data port 
being 8020.  Did I make a mistake?  The docs are saying default is 200??

IN the Xitami.cfg the setting is 20
#   Specifies the port at which data connections will be made. Xitami
#   scans for free ports, so this is simply the start of a range of
#   ports. The port is shifted by whatever value was used for the
#   server portbase.

    data-port=20

I don't understand the reason for 2 different numbers.  If the port is 
shifted from the base port, or in my case 8000, why would there be a default 
of 200 per docs, and 20 in the xitami.cfg??