I just noticed that at least two Marriott hotels in Shanghai had the category increase probably in April. According to Marriott 2018 category change page, Courtyard Shanghai Central is cateogory 1 and JW Marriott Hotel Shanghai at Tomorrow Square is 5. Now it's 2 and 6 on Marriott website. Does Marriott start to change category without notice or I missed something?

JW Marriott Hotel Shanghai at Tomorrow Square
Courtyard Shanghai Central