Ok so:

1. I could fix this spacing issue by writing a word with three characters, erasing the two last, then rewriting one character and then a space or my money back.
2. It also seems to work by inserting two spaces in a row.
3. Erasing entire words with the control key recreates the bug, but only for the first word I'm inserting (the space before it is erased).
4. Inserting images erases the text in the post.
5. Editing a post to insert an hashtag doesn't seem to edit the err, keywords database I guess?
6. The #bonfire_feedback hashtag seems misformatted?