The preview seems to (occasionally) remove all linebreaks after previewing a post.
I don't think it's just me - I think I've seem other posts that have been similarly affected?
""how do you know that"
I don't know - see above - but you said youself, "happened with some of my posts too"
Which does tend to support my theory
Erik has also confirmed that he's seen a similar-looking effect.
ya, happened with some of my posts too only forgot to change name this time before posting