Hi Minesh,
It looks like the template was switched on the second grade page to a different template. Not sure how that happened but it's back now. (screenshot for what it should be)
Can you please send me admin access details and let me check whats going wrong with your setup.
*** Please make a FULL BACKUP of your database and website.***
I would also eventually need to request temporary access (WP-Admin and FTP) to your site. Preferably to a test site where the problem has been replicated if possible in order to be of better help and check if some configurations might need to be changed.
I have set the next reply to private which means only you and I have access to it.