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grading error

I have used gradecam many times and it has worked great or at least I hope it has. Today I was grading a test and noticed that a student who usually scores very high got an unusually low score. As I double checked my key it was correct so I double checked the grading results and noticed that it was incorrect. For example the correct answer was A the student put A but gradecam recorded that the student but B and marked it incorrect. I deleted the scan and rescanned it and the second time it scored it correctly. I then decided to rescore all of the texts and realized that it was still making errors. I just noticed this today but it makes me concerned with past grades I have given my students. What could the problem be?

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