Why is there such a subtle difference in salary and treatment in the recruitment information released by the same online recruitment?

Why is there a little difference in the processing of online recruitment information? One is issued by the personnel department, and the other is issued by human resources. Why is the information released different? This is because they want to advertise. Some people may be better at advertising, but the actual salary may be worse. So when they advertise, they will be a little better, and most people can't see it. Even if someone can see it, what can they do with him? That's why this is happening.