Question: Non/linear fit of near zero data points

I have a data point set:



I wanna make the least square fit with function in form of:


also the command looks like:


I found out the least square fit is not correct using the near-zero values in 'ads_mnozstvi' vector (the parameters have no physical sense).

The correct a,b values can be obtained when 'ads_mnozstvi' values are multiplied by 1000. The correct a,b values thus are:


Why Maple cannot make correct fit with near-zero values?

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