I was very busy yesterday but nevertheless I found some minutes to check my tables. I will look more thoroughly today but what I found with a first fast sweep was the following
1) I think I found a mistake were when the message of the democratic rebellion should be shown only if koinon boioton exists the message shows even if the faction is extinct. In your case does it exist ?
2) This event as it is stated in the message has some implications according to gameplay difficulty level. Armies may or may not spawn depending your level. In which level do you play?
More stuff soon. Thanks for your feedback
P.S when I was writing this message I did not notice your reply above. I will get into diplomacy and liberators in my next reply as well. Feel free to post whatever other stuff you feel you need an answer or clarification