These are special formatting lines, in your case most probably paragraph border 
lines.
I believe you have AutoFormat (see Format->AutoFormat) enabled.
With AutoFormat enabled these lines are added by typing (for example):

---<ENTER>
===<ENTER>
___<ENTER>

etc.etc.

Each of these lines will have a different style/width.

To disable this feature select Tools->AutoCorrect, choose the "Options"
tab and under the [T] column deselect "Apply Border".

-- 
an indelible line is added sporadicaly
https://bugs.launchpad.net/bugs/110726
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