Can someone re-sell your Art work in there own store after purchasing from a gallery?

Hi, I have been selling my work at "Art One gallery" in Scottsdale,AZ for 8 years. Last year I moved to Copenhagen but still have my work in the gallery. It has come to my attention that over 10 pieces of my work that were sold and paid for from Art One are being re-sold at an antique warehouse that is owned by the purchaser of these works, Is it legal to re-sell an artist work? The gallery Im represented by is set up as a nonprofit and not a whole seller,I'm not sure if that matters? I would like to know before I confront my dealer if this is legal. I never wanted my work to end up at this store, I feel it discredits my work and Will effect future sales. I had a collector see my work at this place and they feel a bit put off by this and I worry about how much damage this has done.Do I have any rights in this case? Thank you for your time, Matt.