ah, ya, i know why that is happening
basically, you are not supposed to have turns interspersed, or they may be weird effects
essentially, the game keeps track of which territories are conquered for a turn, but it doesn’t do so on a per player basis,
in addition, the game validates where units can land at the end of noncombat phases, unless you have purchased a carrier and are validating fighter, etc etc, complex stuff
anyway, i suggest you either have the Chinese and American turns COMPLETELY separate from each other
OR you leave the game xml as it currently is (since it works well already)
I honestly do not think this affects the game at all, because China gets completely destroyed in the first 2 turns anyway.
In 3 years of people playing this and testing it (AA50 is the most popular game on triplea, and there are at least 20-60 games of it played every day), noone has ever noticed this “bug” or reported it. So that means it does not affect any ‘real’ games.