Hi Peng,
do you face this only for you ID/few users or for every user these 2 fields are not editable ? you have to check this by asking your colleagues/users .
If it is problem with few users then they have done some authorization check here only for few users.
if it is for all, then as mentioned by Venugopal, some enhancement is done for this to make non editable these fields.
What to you want, do you want to make it editable fields or do you just want to know why it has done ?
Regards
Sundar