Kmail2 is crazy?

Hello,
I use Kmail2 and is mad. I downloaded this afternoon from my server 1202 
repeated messages. Some messages were repeated over 20 times. I looked at my 
web mail before downloading pop messages from the server and only had 3 
messages. Kmail2 take to download the same messages over and over again for a 
week.
What I can do? Is there a solution?
Thank you very much for everything
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