WTF is going on with formatting?

[zatnikatel.livejournal.com]

One of my reviewers PM-d me to say an older story of mine had been stripped of its paragraph breaks and sure enough it had: had to copy/paste and reupload the whole thing with all of the pg breaks reinstated. WTF? Has anyone noticed this?

It did happen a  while back in a WIP I was posting but it only seemed to occur in a couple of chapters and then stopped happening.