Inserted blank lines

[Morrus]

This is hard to explain!

I seem to have a problem with post formatting. The editor seems to like inserting extra blank lines where they aren't wanted. This occurs frequently when using billeted lists or indents or other formatting, but not exclusively so.

Any idea what might be causing that and what I can do to stop it? I know it's kinda vague - it's surprisingly had to explain, and you can't just show a screenshot of a post with some extra blank lines in it as an example!