I saved my alpha 12 game from my post above and reloaded it and the cyborgs comes to attack me as soon as there are a group of four of each factory together. It seems it's not a problem of savegames. I have another suggestion: Was in your game a moment where you had only hover units on the map? Maybe if they are all over water there are no units on the map that the cyborgs could attack. And then they collect them around their factories.
Please help.
I didn't find the right solution from the Internet.