The COGS on my Profit and Loss Statement is not running correctly.  It includes BOTH lines corresponding to each sale (as it should) AS WELL AS lines corresponding to each purchase from our vendor (which it shouldn't).  Have I checked a wrong box somewhere?

Example

01/07/2018   Invoice 17-101 Customer Product A     Accounts Receivable 300.00
01/23/2018   Bill 2935             Vendor     Product A     Accounts Payable       300.00

Thanks!