Yeah in my bactrian game (much hard to reach the 1st UVH than before with the older map, but doable, by the way) it was the same ; Seleucids had all Anatolia (except Pontus) and Egypt. As usual, Parthans didn't crush them...
I wonder is if would be better to make some IA at peace (at least at spawn) with far away independant cities, because when they are at peace with other civs, they send a lot of troops to conquer them - it's a waste of time.