Piixelgamercat

Okay so I got a trade request from a new Nation named better Soviet union and they wanted 1 food and they would give away like a ton of money I think they thought they would get 1 food and get a lot of money anyways I clicked buy because why not and it said "you cannot buy this because you made this on the same device (or something like that) you cannot have more than 1 Nation you will be banned" idk what that means but I'm pretty sure I didn't make that how can I fix this?