I see a few possibilities on why they are rolling. (besides the one mentioned above)
Somehow you saw a 7th edition game being played using the old rule which did require a roll (although I thought it was a leadership thing)
They are rolling the Cadian warlord trait. Which allows an order to take effect on another unit on a 4+.
They were rolling the Laurels of Command Artifact (roll a die after an order is issued, on a 4+ the character may issue another order)
I suspect it was the last as it would be rolled every time an order was issued.
In any case, you no longer roll. If a unit meets the criteria (is within the range and an infantry unit etc etc) the order works and they have it.
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