I was playing a game and there were 4 planets in a line A ----- B ------ C ------- D.
A and D were connected to others, but B and C were isolated in the middle of this line.
I controled B and enemy had C. I spammed culture (3 on a asteriod), and began to influence the enemy on plannet C. I had a culture rate of 16.5.
The enemy then builds ONE culture station at plannet C, which give it a culture rate of 10. This is enough to completely counter my culture, and plannet C goes back to 100% allegance (was enemy homeworld).
I was Vasari, enemy was Tec. WE both had starbases at our plannets, and there were no capital ships anywhere near for quite a while, so capital ships are not a part of the equation here.
Then I upgraded my culture fully (researched every possible tech in the Vas culture tree), and my culture rate remained the same at 16.5.
All this leaves me to wonder how the culture machanics work? Or was what I experienced one of the many bugs that seems to be ignored?
PS - I have a replay if anyone cares to see it (actually a pretty good 4v4). While your watchin it you can also watch me try in futility to get my ships to fly between two phase gates, they continuously attempted take the long trip through 10 plannets rather than use the phase gates to fly straight there. Then suddenly, after about 5 mins of issuing orders and playing silly games, I could use the phase gates.