The text is ambiguous. Contrast the following two readings:
Answer a, question with score of 1 or more.
Answer a question, with score of 1 or more.
However a "teacher" is normally the person who gives knowledge to others. As such; the second reading, where your answer is the subject, is the correct reading. You also got awarded for the second.
Note: the feature is still under development. This answer risks being out-of-date the moment I post it. For up-to-date information, see the MSE post "New onboarding for review queues".
Is this a bug? Is this a new feature that everyone sees?
It's a new feature that everyone sees first time they enter a specific queue. You'll see it (at least) ...