Question: A strange result which requires explanation

Can anyone explain me the reason of the last result?
Thanks in advance

restart

kernelopts(version)

`Maple 2015.2, APPLE UNIVERSAL OSX, Dec 20 2015, Build ID 1097895`

(1)

a/n^b;
den := denom(%);
print(cat(`_`$50));

3/n^2;
den := denom(%);
print(cat(`_`$50));

1.23/n^1.65;
den := denom(%);
num := numer(%%);

a/n^b

 

n^b

 

__________________________________________________

 

3/n^2

 

n^2

 

__________________________________________________

 

1.23/n^1.65

 

1

 

1.23/n^1.65

(2)
 

 

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