I have around 20 data points in a range that I plot as a Histogram. The plot follows a Gaussian pattern, so I used the ‘gaus’ fit from the ‘FitPanel’.
Now when I use without any of the check boxes ticked, the mean and sigma varies from when the ‘Empty bins, weights=1’ option is ticked. The sigma improves from 1.8 to 1.5, I just wanted to know:

the significance of this option in the statistics

is the correct approach and when should I use or avoid it?
I can only post one image, but you probably get the idea.