Playing a game on Colossal Crusade and when viewing turn history it is adding +3 units to every territory. Say a territory has a 4 on it - in history it would show it as a 7.
There is a common history bug that has a simple workaround. See if this works for you. When you notice the unit counts being off, backup in the history a bit (left arrow), then go back forward (right arrow), usually this clears out the wrong unit counts.