Confused about 1099-K situation from selling personal items on Reverb.com

According to the 1099-K I just received, I sold around $5800 worth of my own personal music gear (19 items) last year on Reverb.com, but after calculating the total amount of my net earnings (after remitted sales tax and Reverb listing fees) it only adds up to about $5300. Does the difference between what the items sold for on the website, including tax, and the net earnings I ended up getting count as an overall loss? Meaning I won't get taxed for any of it? I know the $600 threshold got delayed to 2023 tax reporting, but I live in California which still has the $600 threshold.