admin_dropdown doesn't work when we have at least two admin_dropdowns

Hello,
I have two connection_types to the same post-type.
When I’m using first admin_dropdown it works correctly.
When I’m using second admin_dropdown it doesn’t work.
How can I quickly repair this? I need to have many connection_types to the same post-type & every admin_dropdown should work correctly.

Best regards,
Ania

http://ww.wp.xz.cn/extend/plugins/posts-to-posts/