I have great knowledge of WordPress website building, theme development and plugin development.
I have taken a look in the plugin's code and found a static function manage() in results controller... which handles add, save, delete. I don't know exactly of course what is the problem, but if I see the code I think there is no other possible outcome but to fix it.
If you like you can contact me and discuss further details. Thanks for your time!
Yours sincerely,
George Karametas