While pondering on which characters to bring out, we noticed something unexpected. Our veteran Soso now has 75 STR rather than 70 just a few weeks ago. We haven't gone through our other characters to see if any of their attributes have changed but we'll be sure to take extra notice when bringing them out.
Another odd thing was that our newly recruited Angie suddenly became level 20 without leaving the barracks. The only time we brought her out was on the first day we recruited her and she was level 1. To confirm that she did reach that level, we brought her out again and had her wear the level 20 equipment from our warehouse.