Time: N/A (happens repeatedly)
Frequency: Every time my retainer completes a Quick Exploration venture
World name: Excalibur
Character name: Omega Omicron
NPC name: Lisabella is the name of my retainer
Monster name: N/A
Class/Level: My retainer is a level 26 Miner
Party or solo: N/A
In-game time: N/A (happens repeatedly)
Area and coordinates: Old Gridania, 14X 9Y
Steps:
1. Note your current progress on the "Venture Bothers" challenge in the challenge log under the "Retainer Ventures" section
2. Assign a "Quick Exploration" venture to your retainer
3. Wait for the retainer to complete the venture
4. View the venture report, and then check the progress of the "Venture Bothers" challenge again
Current result:
It will be at the same point where it was before the "Quick Exploration" venture was completed
Expected result:
It should be 1 higher than it was before the "Quick Exploration" venture was completed

Note: Having a retainer complete "Highland Exploration" ventures does count towards the "Venture Bothers" challenge, but you can't expect us to have a retainer do that 15 times in one week (which is the goal), because that is mathematically impossible. "Highland Exploration" ventures take 18 hours to complete, and 15 * 18 = 270, but there are only 168 hours in a week.