Grindstone does not reset enchanting cost with books on anvil

I just disenchanted my Netherite chest plate and then tried to enchant it with a book of, fire protection IV, unbreaking III and Mending I and the anvil says Too Expensive and will not let me enchant it. I'm stuck with a plain netherite chest plate now.

I have a video below ,sorry for the noise I'm at my auto raid farm with my friend.

Thank you