I use the WooCommerce product grid.
When I choose a specific category, top right of the block with the "choose a category +".
if I choose smartphones, it's good, it only shows me smartphones. if i click on another tab, it loses me the chosen category and shows me all the categories.
I looked on your example page http://rewise.wpsoul.net/ and it is the same.
Is there a solution to keep the chosen category or is it the Woocommerce solution that is like that?