If I move any troop out of a city and back in after I build them they get additional HP like the Kings Ward in the following 2 screenshots. On screenshot 1 they have just been moved out of the city right after I build them. In the next screen I've moved them back into the city the next turn and voila they get an additional 5HP. This only ever works one time.
Oh, I forgot to mention that this happened during the campaign. I have not tested if it also happens in a free game.
I guess that this is a bug or have I missed something?

