Imported Avada 'Website' appears significantly different to preview

I have used several versions of Avada over different websites and I’ve come back again to make a new one with their theme as initially it was easy to use.

On my latest project however, the AVADA theme preview looks nothing like how it appears once imported on wordpress. The slick appearance of the menu header looks like something from 1994 once added to wordpress.

Thanks in advance for any suggestions.