[libreoffice-users] Automatic line creation

I have been using OOo, now LibreOffice 3.4.6, currently on Fedora 16,
x86_64 for many, many years. In fact, I started with StarOffice 0.91. 

Today I wanted to type three asterisks and center them in a line as a
device to mark a change of perspective in a work of fiction. After I
typed the three asterisks I hit Enter and suddenly the three asterisks
turned into a bold double line across the page. Not only that, I cannot
delete the double line.

What happened? How can I delete the line? How can I stop this from ever
happening again?

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