After you file

Thank you for the detailed reply and  apologies for the confusing numbers. Let me ask my question a different way. The cost of my personal goods were 7K. The amount of my 1099-K was 6,700. I lost 300.00. Before I entered my 1099-k in TT, my refund was going to be 50.00. After I entered my 1099-k, and recoded all personal items sold at loss and the 10 sold at a Gain ( which again resulted in a NET loss of 300 for me) my refund changed to me owing Money, meaning i had to pay tax on the 1099-K even though i lost 300.00. Is that correct? This is the main question I am wondering? TY!