I remember reading somewhere in the Galciv2 forum or in a journal that the DEV team were interested in any strange effects showing up in the drawing of the boudaries between powers. I checked the forum, but could not find any related post, and could also no longer find the original statement.
So if you're still interested, I've just sent a save game (v 0.31 beta 3A) that shows interesting boundaries from (103,125) to (105,122). I had just colonized the planet at (108,126) when this showed up first, and it stays the same when playing a few turns...