Category link returns 404 on 1 site in multi-site network

On one of our sites when a user clicks a category link it goes to a 404 page.
Non-working: https://blogs.caryacademy.org/heidimaloy/category/uncategorized/

Although other sites on our network, the catgory links works fine
Working: https://blogs.caryacademy.org/china/category/uncategorized/