I'm returning to Shogun 2 after not playing it much at launch (life, small children, other terrible inconveniences...)

I've got an idiotically simple problem: when I command units to move, they often run when I don't want them to. This happens a lot if units are grouped or I'm rubber-banding their formations by right-click-drag.

Is this normal behaviour? I'm used to single-click walk, double-click run. Am I an idiot or does Shogun 2 just do this?

(I tried to search for this, but "run" isn't a great search term)