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Yes I use LibreOffice for writing and spell checking. I use bluefish for html and php. So you write the markdown when you are making the post on steemit correct?

I had a similar problem in the past. I created my text in OneNote (with the markdown code) and copied it to steem. This caused a lot of problems with strange behaviours.
Now I'm using a simple texteditor (notepad++) and everything is fine.