1099-NEC for single consigned art sale? (asking as consignor)

I contracted with a gallery to sell a single inherited collectible on consignment. It was sold for more than $600 above the cost basis (valuation as of inheritance).

 

My assumption was that I would report this/pay for it as a long-term capital gain off of the cost basis. However, I've received a 1099-NEC from the gallery (for the amount I was paid—ie, sale price minus gallery's percentage).

 

It seems like this means I have to file like I am running a business, which I am not in any sense of the word. Did I get the wrong form/am I misunderstanding? Should they have issued a 1099-Misc or a different form? Any advice appreciated.