cant access blog dashboard from within the network admin


I have around 8 blogs in my website - out of these i have configured domain mapping for 3 blogs.

to manage a blog i sometimes go to the blog dashboad my going to >> network admin >> sites

I am not asked for the login details of the blog while accessing any dashboard except the two blogs (lucky02 and mohith2015

To access the above two blogs i am being redirected to the login screen when i am trying to access the blog dashboards through network admin >> sites >> dashboard

Please let me know why this is is happening

i have granted support access in case you need to check the dashboard