Levi, there's some logic to this. When you are taking heroes, you are generally clearing patrols and packs, including the pack associated with whichever boss(es) you are farming. This would tend to not trigger anti-farm. Without any special knowledge, I'd say that to the anti-farm code, this just looks like normal play and exploration.
When you solo, you are generally running to the boss' location, and using whatever build you use to just kill him. When you repeatedly kill just the boss and zone out, that would tend to trigger anti-farm. This sort of activity would be pretty easy for anti-farm code to recognize.
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