I have no answer.
However can you identify some characteristics of those "strange" PC?
And is there something different when you look at the quiz results (attempts).
There could be a rounding if there is a number conversion from 0.0 numbers to 0,0 numbers or if the number keyboard has been used or not.
P.S. I am working on this rounding PHP calculated question problem which as old as the calculated question itself...
Unexpected results with partial scoring
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