I think he is talking about at the end of a line.

If you have a line that is terminated by a "hard return" (CR + LF), then that line will always terminate at that point, starting a new line. But if you let the software insert "soft returns" (word wrap) as needed, then lines will automatically adjust to fill each line as much as possible.

I could be wrong, but I am guessing that Ralph manually presses enter when he gets to the end of a line, instead of just continuing to type and letting the software start the new line. But then when he adds new text above that hard return, and subsequent text gets shifted to make room, some of those hard returns get wrapped onto new lines which promptly terminate at that hard return (leaving a lot of blank line, or whitespace).

If this is the case, Ralph, just get into the habit of never pressing enter until and unless you want to terminate a line unconditionally (for example, to start a new paragraph). Not only will your edited posts still look right, but your unedited ones will look better too. Remember, the normal post window is wider than the editing window into which you type.