Last week both heroes were repeated to me, but this is the only time that has ever happened to me. I think it's a lucky thing (but if in your case you have two months with the same x10 heroes, it may be a bug in your game).
March 2018 - last edited March 2018
NightCap again for me this week. Is too hard to conclude this kind of things like a "bug" because we know this is "random" right? So probably pure coincidence? Anyways, bump this thread, waiting for the hero of the next week.