box width increasing for each click

i installed the plugin on my site and i have a strange problem.
at the first time i click on image, all is o k. but from the second time, the width of the box increase and increas each time i click on the image.
example here:
http://test.haatarsheli.com/eventing/%D7%97%D7%AA%D7%95%D7%A0%D7%94/%D7%9E%D7%A9%D7%9B%D7%99%D7%A8-%D7%9E%D7%9B%D7%95%D7%A0%D7%95%D7%AA/%D7%9E%D7%A9%D7%9B%D7%99%D7%A8-%D7%9E%D7%9B%D7%95%D7%A0%D7%95%D7%AA-%D7%A4%D7%95%D7%A4%D7%A7%D7%95%D7%A8%D7%9F/%D7%94%D7%9E%D7%A8%D7%9B%D7%96/%D7%AA%D7%9C-%D7%90%D7%91%D7%99%D7%91/%D7%90%D7%97%D7%9C%D7%94-%D7%91%D7%A2%D7%95%D7%9C%D7%9D/715452-5-jpeg/

http://wordpress.org/plugins/lightbox-plus/