[Plugin Sidebar-login] Redirection automatically to wp-admin

Hello,
I’m using wordpress 3.0.1 and the sidebar-login plugin 2.2.14.
In the option page of the plugin, i leave Blank the option for URL redirection after login and logout.
When users are connecting to my website, they are automatically redirected to the their wp-admin page.
I tried to understand the problem. I know that the action of the post method of the html form is good. My login and my password are good too.
My website is http://www.restedumonde.fr/blog. I can create a new user with a easy password for someone who wants to help me.

Sorry for my bad english!!

Thanks in advance