I have submitted a ticket on this.
Playing an immense game as Altarians I found a Yor colony deep in my territory of influence. It did not flip, undoubtedly because it had the Malevolent trait that makes colonies immune to influence. However, at turn 201 a weird thing appeared. Note that the Altarian colonies have influences over 100, while the Yor colony has an influence less than 50. But the Yor colony has somehow created a narrow band of influence that is capturing two Altarian colonies.