Platform, device version and operating system:
What you were expecting to happen, and what actually happened:
I was expecting campaign tasks to require the same effort each time they show up again. This isn’t true for the silver Adventurer tasks, sometimes it requires two Adventure Board clears, sometimes it requires three Adventure Board clears.
How often does this happen? When did it begin happening?
Ever since campaigns started. So far the 3 day variant has shown up twice, in between multiple occurrences of the 2 day variant.
Steps to make it happen again
Generate silver campaign tasks. Barring someone messing around with game configurations the most likely cause is that there are two silver Adventurer tasks, a 2 day variant supposed to be in the silver task pool and a 3 day variant originally intended as gold task and somehow incorrectly included in the silver task pool.