Random NFT deposits in wallet?

Hello all,

I am using the Ravencoin Core Wallet app to store my NFT’s on the RVN blockchain. Over the last few weeks I’ve noticed quite a few random NFT’s appearing in my wallet? Should I be concerned? I have only purchased NFT’s on Ravenist and my wallet is not on an Exchange. Like I said, it’s the Ravencoin Core Wallet. Any thoughts?