-P not working correctly?

Hi!

I want to mirror the website:
http://web.pertus.com.pl/~andyk/
into the directory
/www/wyciszanie.pc

I use it like that:
wget -m -nv -k -K -E -nH -p -np -t 1000 -D web.pertus.com.pl -o 
$HOME/logiwget/logwyciszanie -P /www/wyciszanie.pc 
http://web.pertus.com.pl/~andyk/

Unfortunately it creates a subdirectory %7Eandyk with all the downloaded 
files in the wyciszanie.pc directory instead of putting index.html there.
Why is it like that? How can I prevent such behaviour of wget?

a.