We had several pages that were specifically named directly under the root of the website. For example, www.sample.com/sample-page.html. We just discovered today that some of the sef URLs had been changed to a generic name in a sub directory named for their section. For example: www.sample.com/sample-section/index.html and www.sample.com/sample-section/2.html.

Has anyone here experienced this? Does anyone have any idea what causes this and how it can be prevented?

Thank you,
Lisa