Strange entries in keyserver-listings

[Christoph Anton Mitterer]

Hi.

Short question... *g*

When you look e.g. at 
http://pgp.mit.edu:11371/pks/lookup?op=vindex&search=0x6B6EEFC9.

You'll see the following:
------------------------------------------------------------------------
Public Key Server -- Verbose Index ``0x6B6EEFC9 ''

Type bits /keyID    Date       User ID
pub  1024D/6B6EEFC9 2004/03/22 Martin Roll <martin at roll.tk>
sig        6EF2BDF5             Rainer W. Gerling <rgerling at gmx.de>
sig        BE8DC15F             Michael Decker <ThReCa at Web.de>
sig        67B82F43             Christoph Anton Mitterer 
<cam at mathematica.scientia.net>
sig        833C9A4A             Benno Rieger <ben at ffmf.de>
sig        E49FF38D             Wolfgang Liegel <wolfgang at liegel.net>
sig        6B6EEFC9             Martin Roll <martin at roll.tk>
                               Martin Roll <martin at roll.tk>
sig        67B82F43             Christoph Anton Mitterer 
<cam at mathematica.scientia.net>
sig        833C9A4A             Benno Rieger <ben at ffmf.de>
sig        6B6EEFC9             Martin Roll <martin at roll.tk>
------------------------------------------------------------------------

As you can see the same UID is listed twice (!!) and also parts of the 
signatures are listed twice.

Why is this the case and how can I avoid this? Or is this at all a 
key-server-software-only related issue?

Best wishes,
Chris.
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