3D objects looks dark

i’m using the plugin 3D Viewer and I’m having problems because when I view the page containing the shortcode of my 3d model in the editor, it looks shiny. However when I refresh and go to the url of that page, it looks dark. This happens when in the «lite» mode I can adjust the exposure, but in the advance mode, which is the one I need to adjust angles and so on, it doesn’t let me save the exposure changes of the lite mode, because in the Advance mode there is no option for this. How can I make the model look just as it is displayed in the editor, with that exposure?

Thanks, 

La página con la que necesito ayuda: [accede para ver el enlace]