You have a lot of control over how OpenOffice is set up. One of them is automatic formatting. I recommend turning off most of it. Here are two things to do that will make OOo work the way you want.
Choose Tools > Autocorrect, Options tab, and unmark everything from the second line on down. This will prevent, among other things, the numbering formatting that starts when you don't expect it.
Then choose Tools > Options > Writer > Print and unmark the circled option. It will take out that annoying extra page you get sometimes and you don't know why . (It has to do with right-left pagination for books.)