So basically I set groupDetect to off on every quests in the JSON. However, whenever I go to the tasks on a quest they sometimes display as 1 and sometimes as 0 without me changing anything. One time even when saving they reverted to 1 again.

If the changelog is correct, I'm guessing that this is fixed now.

Actually, after testing, it seems that it still occurs.

Any specific value or the same as the first?

It's the same as the first. The first time I go to edit a task in a quest, groupDetect is 0, the second time it's 1. And it's not just visual as when I save it, it's 1 in the JSON.