maybe you ran out of spendable influence? (I'll have to take a look at that one)
Definitely not that, I can "greatly influence" 2 options, but the one that encourages peace in general just increases conflict, for example, I have three options in that last choice for Revaire, Increase Peace (which only increases conflict ), Increase Allies who are for Peace, and Argue for better negotiations for Revaire.
By the way, I sorry for the nitpicks, this is a marvelous game that I love and have been looking forward for years. It is every bit as good as I ever imagined! Thank you for it!