Question: Parenthesis and brackets in Maple

Just a question about Maple's formatting.  When I type parenthesis, brackets, or absolute value bars, how do I control what size they are displayed?  I'm typing a bunch of expressions as in-line comments for an assignment, and there are multiple parts with parenthesis within brackets, etc.  On certain lines, ever time I put a space after typing, the size of brackets on a previous line will alternate between large and small.  I can insert spaces into random sections of the expression and this will change the size of various parenthesis, sometimes making it so that the opening and closing parenthesis of an expression are not the same size.

Can someone explain this, or point me towards some documentation of maple's logic here?

Thanks.