I like the books as far as the story but there’s parts that ruin it for me

it’s has broken game mechanics that would be disastrous, and im not talking about be stuck in the game and all. I’m at the part where they’re in mid-run and they find out about why the world’s dying. you know where the great vanguard fought the worldboss and all. They killed the it, but the worldboss remembers the fight after respawning and about the world energy. This is the broken part I don’t like, it doesn’t make sense why would the mobs have memories after respawning. another would be the lich worldboss that can move to otherworlds and over take the worldboss of that world, this is also dumb to me.