I loved it but it doesn't work :(

I thought I finaly found a theme that will be perfect for the site i’m building at the moment. At first it looked great, then i wanted to make some change in settings, like change category that will be displayed and since then it doesn’t work. On my homepage is showed only menu and slider which doesn’t work properly either. Plus when i move with mouse it looks like the whole screen is moving. Can it be fixed or I have to continue my search for another perfect theme? Thank you!