Influence points degradation rate

Hi all,
In my current game I found that my first allied maritime CS is degrading 1 IP per turn and the second allied maritime CS is degrading 1.5 IP per turn. I do not have any of patronage policies activated. An all civilizations are in medieval or renesaince era - no United Front policy. Playing standard size as India on King difficulty. Any ideas how to get the second CS to degrade 1 IP per turn are appreciated.
P.

It depends on their "mood" or what it's called.
If a citystate is hostile, then they depreceate 1.5 point pr.turn. It has nothing to do with you having more CS as friends/allies.

Their personality; they can be Friendly, Irrational, Hostile, or Neutral.

Also, if you declare war on and conquer a lot of city states, then I think city state degradation rate goes up.