If you use preset strategic objectives or create a Fully Managed Campaign using Mass Campaigns, you may find the negative algorithm negating keywords on search terms with sales.
It is due to negative rules such as [ASIN] Remove Search Terms with Orders.
Such negative rules are often used together with import rules to control the advertising budget more efficiently.
When the algorithms find a search term with orders, the import rules will create an exact, phrase, and broad keyword in each ad group, while the negative rules will create a negative keyword for the phrase and broad ad group.