Jay Freedman's response posted by Mossey is the answer in case anyone has a question. It is a combination of AutoFormat as you Type and style for following paragraph. And yes, the same problem could pop up in Word 2016 as easily as in Word 97.
My personal preferences for those settings are shown in the screenshot below. I find that unchecking everything in the second two groups makes Word far more manageable. I believe that the ones that can cause the current issue include automatically applying heading styles and automatically defining styles according to formatting.
The heading styles by default have a setting to have the style for the paragraph following a heading style to be the normal style. (I usually change that setting, too.)
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