Diplomacy Bug

[VascoDaGame]

It is hard to grasp if this is really a bug. But it seems a lot like it. I am playing the Azteks on King difficulty and on a huge map. It is turn 110 on marathon (2410 BC). My military is one of the biggest in the world - only Rome, Russia and the Kongo have about a unit more than me. In all other areas I am at least second place.

Suddenly the Kongo and Sumer are simultaneously declaring war on me (about 15 turns ago) although both are about 20-30 tiles away from me (multiplpe city states between us) and I have done nothing to generate diplomatic penalties (no war, no settling, no religion for kongo, no denouncing). I thought ok, maybe some hidden agenda I triggered.

This turn though again a double war declaration. This time from Brazil (about 50 tiles away, half way to the other side of the pangea map) and myself oddly enough. Although after looking at the message queue it was clear that the other war party is Spain (so this at least is definitely a bug). I have never met Spain before so how can they even declare war on me? I am decently confident that this shouldn't be the case and that a bug is causing these issues.

Maybe they wanted to go to war with each other? Kongo and Sumeria are close neighbors and I assume that Spain is close to Brazil as well since pretty much the only part of the map I haven't explored yet is the part south of Brazil. A few turns after declaring war on me. Kongo and Sumeria also went to war with each other could it be that they wanted to do that before as well?

EDIT: Turn 118 Brazil offered a peacedeal with money. 3 turns later! No fights happened. But they declared war on a city states and Rome. The war with Rome ended 5 turns later also on Pedro's initiative.

 

[Wellfooled]

I recently had a similar event happen. I met Japan for the first time and the turn afterward he declares war against me (with only a -3 first impression diplomatic penalty) and immediately afterward I get a message that Teddy (myself) is also declaring war against me. In the notifications afterward it was actually Japan and an unmet Civilization that declared war. Japan has thus far not accepted any peace deal aside from outrageous ones where I offer entire cities, which seems unusual for someone who is completely neutral toward me diplomatically.

 

[VascoDaGame]

Next try. Again Marathon and King difficulty. This time as Gilgamesh. Now this happened (turn 72):

And you guessed it. I haven't met Kongo yet.
And yes, there is a second declaration of war again. This time from Teddy Roosevelt who again is on the other side of the map (~50 tiles away) and up until now nothing indicated any bad blood between us. He even thanked me a few rounds ago for keeping the peace on the continent oddly enough.

No question anymore. Something is seriously wrong with the AI.

EDIT: I just see this now. They were both declaring a formal war against me but didn't denunciate me before. So my guess that they actually wanted to target someone else is pretty solid I'd say.