OK, I think I know why the AI did it, and if so it would be a very rare case indeed, but nonetheless possible.
Here's the thread: Thread
Basically, if you are in colonial war, and AI invades and begins to occupy a colony of yours, and you grant statehood to that colony while they are in the process of occupying it, the AI may then send that army to one of your core provinces, if you have any that border that former colony.
I think the AI, once finishing occupying, thinks: hey, I just finished occupying a core province, I can now move on to other core provinces!
Here's the thread: Thread
Basically, if you are in colonial war, and AI invades and begins to occupy a colony of yours, and you grant statehood to that colony while they are in the process of occupying it, the AI may then send that army to one of your core provinces, if you have any that border that former colony.
I think the AI, once finishing occupying, thinks: hey, I just finished occupying a core province, I can now move on to other core provinces!
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