Simplefeed changes the feed url

Hi,

When I insert this feed in the simplefeed feed_item contenttype URL field:

http://dy.testnet.nl/click/?sID=24232&cID=13046&sfID=19

I got on submit the following URL back?

http://dy.testnet.nl/click/?sID=24232&cID=13046&sfID=19

I dont' think simplefeed should alter the url. My feed is not working now.
Please help.

thanks in advance,
greetings,
Martijn