I also see this failure mode where it inverts the question and answer the affirmative to the inverted question (therefore the opposite of correct answer).

If you read too quickly or are on a mobile device, the clarifying information may be below the line break.

https://imgur.com/a/tKSQuA3

on a mobile device (iPhone Pro Max) with Large Text enabled you can see how the clarifying text starts to roll over to the next line:

https://imgur.com/a/wvNspMT

Imagine a senior on an older smaller phone with large text enabled, easily missing the Opposite Day answer.