not sure if the following is a bug or some game mechanics that I don't understand: As the Yor I colonized a planet within Krynn territory but close to my border. Of course, the colony started to revolt because Krynn influence was 4 times as high as mine. I countered that with rushing culture buildings and building a Cultural star base close to the planet. At first, things went as expected: the percentage of revolting population increased for a few more turns, it leveled at about 61%. Also, the Krynn influence decreased from 4 times to about 2 times and my Cultural starbase slowly pushed back the Krynn border.
Then, from one turn to the next, the Krynn influence on the colony jumped to 6 times and their border radius increased to my side by several tiles. Is this a bug, or is there some game mechanics at work? Given that it took me several turns to advance my border by just a few tiles, I don't know a game mechanics that does this. I reloaded the game to see if this effect was reproducible, but this does not seem to be the case. Any advice? Thanks!