Welcome @howiezhao
The site that fails is using the "short" certificate chain. The site that works has the normal long chain. There was an error on Nov13 when yintrust was renewed that caused this. Just renewing yintrust cert should fix that. You can see the cert that your site uses with a website like https://decoder.link/sslchecker/yintrust.com/443
Note the longer chain will be expiring and not available starting early next year. If you need to support older Android please follow the next link for instructions and guidance