What does it mean when the professor keeps an eye on me during group presentations (even when someone else is talking) or during exams?

I thought I was being paranoid but my friends have noticed it too. And once after one exam was corrected a professor commented that I was being very quiet during class despite my good results. Does it mean that they think I’m slower than the majority of the students? And why would they look at me when someone else is presenting?

What does it mean when the professor keeps an eye on me during group presentations (even when someone else is talking) or during exams?
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