WP adds multiple custom fields with the same name and value

So after I create new post and add 1 cxustom fieldd, the system automatically always make 3 or 4 custom fields with that same name and value. For example I have custom field t1 and I add the value for it, but when I post new post, I Have 4 t1 custom fields with the same value. Here’s a pic:

http://img152.imageshack.us/f/wpcustom.jpg/

Anyone knows why is this happening?

Thanks!