[CentOS] CentOS 7 iso file SHA-256 hashes

I downloaded CentOS-7-x86_64-Everything.iso (8,233,418,752 bytes) by
clicking on the 'Everything' link in the 'Rolling' line on
https://wiki.centos.org/Download (supposedly the 1611 build).

But when I look in the sha256sum.txt file from
https://buildlogs.centos.org/rolling/7/isos/x86_64/ (where Chrome says that
iso came from), there is no SHA hash for a file of that name. 

The reason I wanted to check it is because it's a different size than
another one I found on my hard drive while looking through the Downloads
history in Chrome.

The other file I found was CentOS-7-x86_64-Everything-1611.iso
(8,280,604,672 bytes), which returns a hash of
af4969ebbdc479d330de97c5bfbb37eedc64c369f009cb15a97f9553ba441c88 and that
matches the value given in the sha256sum.txt file for the file of that name.

So, my question is tri-fold. what's the SHA-256 hash supposed to be for the
file given when clicking the 'Everything' link on centos.org. 
then, why is the 'official' download link sending a file that's not listed
in the hash results. 
and finally, why is the file sent thusly, different from another
'everything' iso allegedly from the same build?

Thanks.