I pushed a faction Bear into a new system, this immediately triggered a war over a planetary asset with faction Owl. I did not want to grab that asset because that asset is plagued with many aggressive missions aimed at the installation. So I fought against invaders to push the victor into a war with other faction so defeated faction could jump over them while there will be busy. Day after defeat their influence was at 3.8% and I already done some courier and passenger mission for them. I'm checked a today and they are gone from the sector! Why?