Does pkg automatically download INDEX?

[Naram Qashat]

I've been noticing this whenever I do a 'pkg version -v', it shows some ports as 
being different from the INDEX, but when I check the actual port, it isn't the 
same version that 'pkg version' shows. I usually rebuild my INDEX manually after 
doing an svn update, so I'm wondering if this is pkg doing something or if I 
have something else doing it. I am running FreeBSD 9.2.

Thanks,
Naram Qashat