Problems with Happiness bug??

[Cryptotec88]

I seem to have a problem with the happiness in my games. I basically don't even have to worry about it. Even the races I conquer are Jubilant within 2-3 turns. My race is stock as far as happiness, I don't build any 'attitude improvement' facilities.

I do get the Messages about my population getting happier because I have a huge military presence in the system--that I understand.
I don't understand the fact of my conquered peoples going from Angry to Jubilant in 2 turns even with a huge fleet in the same system. The fleet isn't even over the planet!

I've played with 3-4 different races so far (made up, not MM's) and without ever messing with the happiness factor I never have any problems with it.
Is it just me?