u/Abalzamo

Guys, i can't explain how this is happening to me. I put a female Gardeivor and a Ditto in the Pokémon Daycare. The Gardeivor is holding the Everstone. Now, there should be a 50% chance the hatchling will have the same nature as Gardeivor, but I've hatched 25 eggs and none of them had a Gardeivor nature. What am I doing wrong? Is it just bad luck?

Sorry if the flair isn't the right one but I didn't know which one to use