html code left behind after colorchange (odt)

Hello,
I try to do my first website with joomla.
As a source for my articles I use an OpenOffice .odt file.
To write a text I take "automatic color". When I copy now this text to 
the joomla the color of the text changes automatic acording the background.
When I change the color of the text in the .odt file the copied text 
will also change the color in joomla accordingly.
When I now change back to automatic color in the .odt file, the copied 
text in joomla doesn't change the color back to automatic anymore!
I saw in the html-code some things left behind after the change!

code before the colorchange:

    <p style="margin-bottom: 0cm; line-height: 150%;"><span
    style="font-size: medium;">Möchten...Vorauszahlung.</span></p>

code ater the change back:

    <p style="margin-bottom: 0cm; line-height: 150%;"><span
    style="color: #000000;"><span style="font-size:
    medium;">Möchten...Vorauszahlung.</span></span></p>

*Is this a bug?* How can I get back to the code for automatic color?
*Can you please help? (to answer my question or to bring my problem to 
the corect person with openoffice)*

Regards
jürg signer
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