Blank/ghost/empty answers appears on Quiz as correct answer
The quiz shows the answer to the blank that I didn't make. When I edit the problem, this blank answer temporarily disappears and then comes back when I save it.
It doesn't seem to affect students' scores, but I want to get an accurate answer to this phenomenon. Also, please tell me if there is any way to solve this error to prevent any confusion from students.
Attached: 1) Image of blank answers 2) Image when I try to edit the question