I'm having a problem with upgrading costs of buildings on a couple of my planets. I'm playing Krynn on super slow tech. Eg: upgrading an advanced market center to a banking center can cost less than upgrading from a trade center to banking center depending on the planet and where the tile is located. Also upgrading factories has the same screwey results, seemingly randomly costing more for upgrading a factory to an enhanced factory/manuf. center than upgrading a basic factory to an enhanced factory/manuf. center. Here's a non modded savegame worked with extra cheese to play around with. Check out Geta II in the upper right and Vitellus V in the bottom right.
Savegame exampleEdit: On closer inspection of the tiles it appears the farthest right column tiles appear minorly bugged when upgrading tiles.
Edit 2: Shazbot, I could've sworn I was in the bug reports section, can a mod please move this post to the right section, sorry bout that.