My settlers are disappearing, it is as though everytime a mine runs out it takes the settler with it (instead of releasing him for reuse). I had about 15 extra settlers a couple of days ago and the only building that I have done was to replace exhausted mines and now my count is down to zero (and no I haven't needed to any new troops).
Is this supposed to happen or is this some kind of bug in the game, I had not noticed this until recently?