When writing a Mathematica sentence (with default input style), you get your code written in a fixed-width font (Consolas, for instance, in Windows). However, small blank spaces are added to separate different parts of the code, and those spaces are variable-width, not fixed-width.
This happens even with comments; see what I mean:
Can this option be disabled, so that the code can be really aligned?
Actually, I really do not know whether they are extra small spaces or just a way in which the padding of characters is modified, but the result is what I tried to show above.