You can't cheat in multiplayer. I think the host made the settings with lower minimum card pieces .
From
https://www.warzone.com/wiki/Card_minimums"If the minimum number of pieces is less than the number of pieces awarded each turn, players will get the minimum and the remainder will be randomed as normal."
This means they could have gotten an extra piece of a diplo card (at the same time you got an extra piece of,say, reinforcement ) which means they'll have a diplo card before you, and you'll have a reinf card before them