Because Facebook supposes that they are two different pages. While you are adding the plugin to your page, pay attention to data-href value. Make your data-href value constant for the same page, although it may be requested with different URLs with extra querystrings.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.