Looks like I misremembered what it said. Here’s what it actually looks like:
Clicking the yellow/orange box adds a disagreement but clicking the green box doesn’t.
Let’s say someone adds a subspecies ID on an observation, but I only know what species it is. Then, I would click the green box when adding a species ID. If I know it’s not that subspecies I would click the yellow box, which would move the observation back to species (if it’s not a maverick ID)
It’s possible that the identifiers didn’t feel confident enough to support the subspecies ID, but they couldn’t rule out the subspecies either. Or, they forgot to add a disagreement.