>>What is the reason for having them out-of-standard on the right-side?
>Out-of-standard is a POV.


It's out-of-standard with the rest of the site's buttons. They are all centered:

(1) I click New, data input form, centered buttons.
(2) I click Reply, data input form, centered buttons.
(3) I click Update, data input form, right-justified buttons.