Form 1099-K

Years ago I purchased my father a mobility scooter.  He passed away recently, and still had the scooter, so I listed it for sale on eBay.  They are telling me I will get a 1099-K, since the scooter was sold for $2000.  I paid taxes on the money I used to buy the scooter, as it was earned through work.  Now, selling it, I'm being taxed again.  Not a big deal or a lot of money, as I have a huge write off this year coming up, but I am not sure if I understand why I would be double taxed or how to put this off to the side.  It doesn't seem right.  Comments?