[Plugin: Shadowbox JS] admin-ajax.php is shown in the browser

I’ve upgraded yesterday two blogs I run with wordpress to the last release, the 3.4.1.
So I’ve upgraded the Shadowbox-js too. And it works fine.
But I’ve been noticing that the stats of my blogs are telling me that some strange URL are been seen :
http://id-libre.org/blogigor/wp-admin/admin-ajax.php?action=shadowboxjs&cache=39ef50e7460fbddd1450913dbd4909be&ver=3.0.3

I don’t understand why. I’ve checked the permission of that file, which are the same as the others in that repertory. I’ve also checked the permission of the files in /var/www/wp-content/uploads/shadow-js/src but couldn’t find any thing strange.

Any clue ? I’m a bit worried by that thing, I must admit.

Thank you 🙂

http://ww.wp.xz.cn/extend/plugins/shadowbox-js/