Most likely you have multiple rules configured that apply to those emails.
Use the condition "stop processing more rules" and sort your rules
accordingly.
See: http://www.howto-outlook.com/faq/duplicates.htm

Signature
Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
http://www.howto-outlook.com/
Outlook FAQ, HowTo, Downloads, Add-Ins and more
http://www.msoutlook.info/
Real World Questions, Real World Answers
-----
> Hello,
>
[quoted text clipped - 7 lines]
>
> L.