Website crushed after import products

Hello guyz and girls,

i would like to ask about problem i got today.
I imported a .csv file (5652 products from another eshop), importing process has finished correctly , i see the products, but my main site(Home) is for some reason destroyed, there is no layout what i made, how is that possible, or how can i solve it please?
Also that .csv file has separated files: items.csv and categories.csv, it should be one file right?

There should be nice Home layout with slider and produtcs, but it’s now looking like it’s bugged.