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Strikeout: On second thought I think they were probably italicized. (But it’s not like I hit the wrong button and never looked at the page until months after. I.e. it seems to have changed on its own.)

The content of the page will never change on it’s own. It’s highly likely a mistake was made when editing that you didn’t notice.

No offense but that's more physically impossible than the page's changing on its own, one way or other. In any case, I wouldn't worry about it until you hear more accounts like it. (How could someone change formatting selectively on your page editor screen?)