Featured image slider

Hi, I'm trying to set featured slider images to posts and pages, but it doesn't work. The images are showing like featured images. I tried to disabling plugins and check but nothing has changed. My site is: http://www.vetroartefatto.it/ And you can see an example of this problem here: http://www.vetroartefatto.it/restauro/ Those are my setting (in case you need them): http://www.vetroartefatto.it/wp-content/uploads/2016/09/Settings.png Thanks for your help :) P.S: English is not my mother tongue, please excuse any errors on my part.