Why my question have automatically duplicated option?

Lê Vân Anh 41 Reputation points

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

The review of my student who has problem


The review of my student who doesn't have problem

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