How does proc Univariate calculate x-axis? I tried using proc Univariate using same data above, the range of X-axis is different then what I'm getting.

With my own data I was trying to fit Weibull distribution. Above method gave me an x-axis range of 0-225 whereas proc Univariate gave me a range of 0-15. When I rescaled my x-axis (quantiles) that I got from using above method to range of 0-15, the shapes from proc uni and the custom method are different. What am I missing over here?