Problem with displaying the plugin when changing month

Let me thank you for this usefull plugin
but i have a problem with the diplay
when i change the month to see the previous post , the plugin dont stay at the same page , it seems like changes the page and it pushes all the other content.

is there any way that the plugin stays at the same page when i click to change the month.

here’s the website link : http://142.83.130.56/wordpress/?page_id=2471