From: Mass. USA. now in OHIO
Pirate bases will increase corruption, as well as unhappiness. I have not been able to confirm that unhappiness does this, but my unhappy planets usually have higher corruption. Pirate bases definitely do, though.
For testing purposes, could you make a save, go in and edit away pirate bases, add troops, starbase and some happiness increasing building as well as some development increasing luxuries just to see how the value fluctuatues?
Also might be related to espionage, but I am not sure if there is a mission which increases corruption.
It is the pirates most likely. Build or drop off some troops and get rid of them. Then the corruption will go down. GP
Intel i7 4.3GHz 10th Gen,16GB Ram,Nvidia GeForce MX330
AKA General Patton
I don't like paying for the same real estate twice..Gen. George S. Patton