[Plugin: amtyThumb] AmtyThumb shows always the same image

I have all my posts with attached image. The plugin creates all the thumbs with different names but always sets the same image for all posts. Also the title and the link are correct. Can you help me?
my blog is http://www.chef-club.com and there is a widget on the right bottom side of the page.

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