Me, them and the Malakim were all going to war against the Kuriotate, but the Svartalfar was inbetween me and the Kuriotate, so I had to negotiate an Open borders with them, I moved my Gilden Silveric and a Satyr through and was attacking a Kuriotate City when it just all of a sudden declares war on the Svartalfar. At the time of it happening none of my units are within Svartalfar borders.
It has happened before aswell, but I let it slide coz I was going to invade them anyway.
PS. I try reloading a savegame from before it happened, but it just happens again right on que.
PPS. I think I may be using an outdated version, still 2025 though... Im downloading the latest one now. Is there anyway to check the exact version of FFH II including patch version?
EDIT: I updated everything to 2025 I (the latest one unless theres something I'm missing) and I still get the same problem