Why my question have automatically duplicated option?

Lê Vân Anh 41 Reputation points
2021-09-27T08:13:39.54+00:00

I made a quiz on MS Form and gave it to my students. When they did the quiz without any problems.
When I recieved the resort, I found out some of questions have more option than I had made. The options had been duplicated.
My students chose the duplicated one and they were not be marked. Some students had this problem, the other did not.
I really want why this happended and how to fix this.
This is what I made
135458-image.png

The review of my student who has problem

135399-image.png

The review of my student who doesn't have problem
135469-image.png

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