Then I realized that the 1st sentence was missing the extra space after the 2nd period, and then M-e jumped to the end of the first sentence. Yeah, my comment

Then I realized that the 1st sentence was missing the extra space after the 2nd period, and then M-e jumped to the end of the first sentence. Yeah, my comment rendered as HTML, which stripped the double-space from the original text I entered. Using double-space means that the source document is unambiguous, thus you preserve options for whatever renders the text—keep the double-space, strip it, convert it to Unicode, etc.