NFTs stuck in my Yoroi wallet

Hiya! I store all my CNFTs in my Yoroi wallet. I’ve put some up for sale on CNFT.IO and got a buyer, but was unable to send the asset itself to the address provided with the sale. By that I mean I chose “send” in Yoroi and then sending asset, etc. Everything seemed just fine, transaction confirmed. The associated amount of ADA was sent but the asset itself remained in my wallet, so after 24h those tokens were sent back (minus fees). I later tried to send those nfts to my Tokhun account, but the same thing happened over and over again: the right amount of ADA was sent, but not the artwork itself. Any idea please, how to troubleshoot this or perhaps a clever way around it?