Why did Neji’s father stil have the Hyuga curse mark on his forehead even after his death? When Neji dies in Naruto Shippuden episode 365, his Hyuga curse mark disappeared from his forehead.

However, why does his father still have it on his head which was reanimated?
It was activated.

I‘m not sure, but in my opinion it could be, because it was activated. The mark can be activated by any member of the main family as a punishment and the person wearing it will suffer from pain. Nejis mark was, as far as i know, never activated, his fathers was. (I don‘t know whih episode, you can see it as a memory from Neji at the jounin-exam)

My theory is, that it‘s only visible after death, when it was activated and burned itself in the forehead.

Maybe i‘m completely wrong and it‘s just a mistake by the editors.