First of all, the "his" will be replaced in one of the next game versions. Thank you for reminding us!
Second of all, the feedback received regarding the loot of the Intrepid Explorer has been passed on and an investigation followed. I will try to explain the finds below.
Every time an explorer goes on an adventure search, a loot table is generated to determine which reward is obtained.
In the case of the Intrepid Explorer, an unskilled one will generate a loot table composed of two loot slots when sent on an adventure search, because of the "Intrepid skill"(let's call it that).
When an Intrepid Explorer with the Wild Determination skill finds map fragments, a modifier is applied, increasing the amount of map fragments found. This skill (like all skills) only applies to the first loot slot. If the skill is maximised (90%), the original loot generated for this slot is multiplied by 1.90 and the total amount is displayed within the first loot slot.
When the Trouble-seeker skill gets triggered for an Intrepid Explorer, a third loot slot is displayed within the generated loot. This slot is not affected by any other skills. The adventure search loot returned by the Intrepid Explorer can hold a maximum of 3 loot slots.
As a result, it is now confirmed that everything is working as intended.