Most likey cause is that in your comment wrap settings you have on the option to 'Preserve width on existing comments' or else you are using the Automatic width for your comment wrap method. In either of these cases, comment wrapping will try to preserve the width of the comment (unless you've just created the whole thing from scratch.) In your case, you have neither blank lines between "Author: " and "Date: " nor special tags (e.g. @param) starting the lines to make it clear that these are separate paragraphs, so it assumes that this is a very narrow three line paragraph and wraps to keep it narrow.
You can first try to turn off 'Preserve width on existing comments' by going to Tools -> Options -> File Extension Setup. Click the Comment Wrap tab and uncheck the 'Preserve width on existing comments' checkbox. (Or type 'comment-wrap-preserve-width N' on the command line.)
If that is already unchecked or you still do not like the results, then, on the same Comment Wrap tab in File Extension Setup, in the Comment width panel, select either Fixed width or Fixed right margin. This should give you a more predictable wrapping style.
If this still does not satisfy you, then disable the feature. Uncheck 'Coment Wrap' in the Document menu. Or uncheck 'Enable comment wrap' in File Extension setup. Or at command line type 'comment-wrap N'.
