Second Import not working anymore (also uninstalling plugin and tried again)

I’ve made a first import of all my products to shopify. And it goes well. Then i deleted all shopify new products, because i want to import just selected products from specific categories (with the specific filter). The import ended successfully but no products are imported in the shopify store.
I’ve tried also with a new shopify developer app with new api tokens, but the result is the same.