Multisite slides

Can someone please help me, i created a multisite for a website and i used the same theme for all the 6 sub sites..i created a slide on the main site homepage..i used a static page for it….but when i go to the subsites, i see the shortcode i attached to the header of the main page at the top of all the sub sites…please how do i fix this and how do i create different slides for the subsites?
thanks