Polynomial regression Coefficient SE results are different from examples


I am running a polynomial regression on 5 sample dilutions and when I am calculating it on my software the results are different.
The raw data is


For example my results for the cubic is as follows:
However, in the example given the standard error of the coefficients are different as seen below:


The coefficient estimate is the same, however, the SE values are different. These were also different in the 1st and 2nd order.
If someone could help me, please, why are the values generated by me different.

Thank you