Question: Inconsistency in Maple 17

In Maple 17, I had

evalf(5^1.25, 30);
7.476743906

evalf(5^(5/4), 30);
7.47674390610610270955949497070

evalf(evalf(5^1.25, 30)-evalf(5^(5/4), 30), 30);
-1.0610270955949497070 *10^(-10)

I would expect the two results to be the same. 

I am using Maple 17 and windows 7 operating system. 

Is there a reason that  evalf(5^1.25, 30) will not compute 30 decimal places?

 

 

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