Just got this on my Unfallen match. The bar is almost 100%, yet they switched to wary and attacked my exploration ships. A couple hundred dust and the last 1% was filled and set to cordial.

From what I understand they were supposed to have fixed this issue in the last update but it still persists. IIRC the issue was with another major faction paying them dust for approval and for some reason that bumps you back to Wary even though you are still in the margin for Cordial.

I really hope this gets resolved.

UPDATE: I just had this happen again, and it seems to occur when I enter the orbit of a system being actively guarded by pirates. It swaps from Cordial to Wary even if the meter is completely full. It swapped before I entered the system. I am not sure if it swapped because I was going to a system beseiged by pirates or if something else triggered this, but it sets me back to Wary even at a 100% full diplomacy meter.

This is actually very annoying and my current game has turned into a babysitting job where I get to babysit the Pirate Diplomacy screen every turn just to prevent surprise pirate attacks. I wouldn't call this "fun" by any measure.

mamarider wrote:

As I understand, support action not only increases your relationship with pirates, but also decreases others'? And it gets back to Wary when other empires support them all together several times?

This is correct. Wary means another player paid more, so the other player is Cordial with the pirates.

Also, every turn the bar lessens a bit. 

I do agree though that with the bar almost 100% it is quite annoying that they attack. Wasn't there a pirate marker on the system?