I ran Find Recruits, Very Easy
19 loot chests
15 recruits, 1 common herbs, 1 leather strips, 1 oil= 18
I ran Collect Gems, Very Easy
9 loot chests
5 recruits, 1 common herbs, 1 fine steel, 1 metal ore, 1 gem= 9
So bonus loot quests ( Gems ) works okay, but bonus resources quests ( iron & recruits ) are missing one.
If double loot quests ( rare quests that drop an ingredient and an ascension item ) have a +1 then it may be a deliberate programming decision to subtract 1 loot chest for all quests.
Where is a rare quest like Frostmarch when you need one?