dovecot - Jul 2016 - dovecot --version tarball

Hi,

Trying to understand what the version numbers mean. I typically build 
from the stable tarball and then apply patches as needed.. however since 
2.2.25 this hasn't been working (not sure if it worked before or never 
really looked closely TBH).

http://dovecot.org/releases/2.2/dovecot-2.2.25.tar.gz - shows GITID 
7be1766 however it has commits / changes newer than this.

Also the github tag for 2.2.25 is c1527e5 which doesn't match the source 
tarball as well.

Should the source tarball and git commit hash be related?

Thanks

Leon