Can’t Specify Cross Sells

I only want ONE particular item to popup as a cross sell option, when customers add certain things to their cart.

I have gone to WooCommerce>Products>SPecific Product>Linked Products, and entered the details into the ‘Cross-Sell’ field, but it doesn’t work. Instead, my customers get spammed with a popup of EIGHT different products, some identical to what they’ve just bought but in a different color! WTF?!

Fix this ASAP please or I’ll be getting my money back