My Flattr button doesn't work

Hello!

I’m new to Flattr.

I added the (auto) buttons to my blog posts, and it worked for one post. Here:
http://tirentext.se/?p=257

But on the second the button shows up, but it doesn´t work (and post doesn’t show up on Flattr site). Here:
http://tirentext.se/?p=278

If you click the button it says “Dålig begäran – user mismatch”.

Have tried to re-authorized but it doesn’t help. Also tried to delete the post and make a new one, but same thing happened.

So is there anything I can do to make it work?

Thank’s a lot!

http://wordpress.org/extend/plugins/flattr/