[1.0.1.705] Militaristic city-states on Marathon

Friendly militaristic city-states give military units approximately every 20 turns on Standard speed. But when I play on Marathon they say, they give units with the same frequency (20 turns). I'm not sure, is it only a text bug or a real bug, but I've received my first unit after 28-29 turns of friendship. So, it looks like a real bug, because militaristic city-states should give units approximately every 60 turns on Marathon, if they give them every 20 turns on Standard speed.