Heroes in Heroes of Might and Magic V.

Okay, let's say there's a map called Carpe Diem – it's just a free-for-all battle for eight players, without a scenario or plot. By "scenario," I mean a "skirmish," a "battle," or a "fight against bots, not in a campaign." So, on this map, you capture seven out of eight towns with just one hero. That is, you can't hire (buy) any more heroes. Is that how it's supposed to be? I repeat, this situation occurs on 80% of maps. Could some mod be interfering?