different beliefs about ownership

This concept was fairly fleshed out in the seventh HP book. Potterverse Goblins believe that ownership is established by creation of an object, which lead to a historic misunderstanding where Godric Griffindor believed that his sword was "sold" to him and the Goblin who made it believed it had only been rented.

You might think that this was set up so that the hero could resolve an old tension between the two groups and make justice, but actually the plot thread was left unresolved. A Goblin tried to steal the sword back as soon as Harry's back was turned, but then later it got re-summoned to Hogwarts by a spell that had been placed on it.