I took and equipped my first Pest Drone Factory in Earthforce. Now I have returned to The Nexus galaxy to complete some very first missions, just for fun, and I found strange bug. There is still a possibility to equip more than one Pest Drone Factory, so... I completed one mission of that lady which says I need to train Drone Deployment, and when I docked to base, the second Pest Drone Factory was automatically equipped to my ship. Then I leaved the base, and launched Pest Drone, but only one Pest Drone Factory was used, then I pushed another one. Two Pest Drones at one time! Very well... I docked to base again, unequipped one Pest Drone Factory, and equipped it again. Now it says I can't equip more than one Pest Drone Factory.

So, twins are still making twins, but not for long