I have a confusion with the Apply function. The Apply function replaces the head of an expression at the desired level. For example:

In[124]:= Apply[Superscript, {{2, 3}}, {1}]  Out[124]= {Superscript[2,3]} 

On the other hand the operator @@@ is equivalent to Apply acting at level {1} :

In[125]:= Superscript @@@ {{2, 3}}  Out[125]= {Superscript[2,3]} 

However the level {1} of the expression is not an argument for Superscript:

In[126]:= Level[{{2, 3}}, {1}]  Out[126]= {{2, 3}}  In[127]:= FullForm[%]  Out[127]=List[List[2,3]] 

Since :

In[131]:= Superscript[List[2, 3]]  Out[131]= Superscript[{2, 3}] 

So it is as if the operator @@@ is acting at level {2}

In[129]:= Level[{{2, 3}}, {2}]  Out[129]= {2, 3}  In[130]:= FullForm[%]  Out[130]=List[2,3] 

and so replacing the head in the last expression is the same as :

In[132]:= Superscript[2, 3]  Out[132]= Superscript[2,3] 

What is happening here?