Scale Mismatch of Scythe Minis

What is the deal with the scale mismatch between the mechs of different factions? Rusviet Mech looks like a dieselpunk exoskeleton maybe 5-6m tall, all the others look like they are giant walking fortresses 20 mt tall. I like the detail on the Rusviet mech to be honest but I still find it a bit jarring. As if it doesn’t belong with the rest of the set.