Answer :
The most likely why there are different results in the calculations in the given samples is because of a parallax error.
What is a Parallax Error?
This refers to a situation where a person who is taking the measurement calculations makes an error based on his angle of viewing which gives him a different value from the original value.
Hence, we can note that parallax error is one of the suspects in this case and it could also be a calculation error or an error which was made when writing down some values.
Read more about parallax error here:
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