[.50 Bug?] Suicide wolves?

On the previous turn, the tile pointed at by the arrow contained 3 wolves.  When I hit the turn button, the animation showed them falling over like they had been killed, but after the animation ended the tile still showed 3 wolves.  When I moved my army to attack, there were no wolves there.  I loaded the autosave (from which I took the screenshot) and it showed that the tile was empty.

Loading the previous autosave shows the wolves in a completely different tile. (I have the autosave frequency set to every turn).

Here's the autosave.

Here's the previous autosave.

Here's the debug.err after loading the previous autosave file.