hmm, it seems related with the system time of router? I didn't connect it to Internet so that the system time is 1984/XX/XX, after I connect it to Internet and sync the system time, the problem went away?
Having a system date in 1984 is a bit weird. The system will start with the date of the most recently accessed file. Since the 19.07.7 was built in 2021 I cannot see why the most recently accessed file seems to have been in 1984.