Tommie: The bug doesn't delete all the journals you make, it just chooses to delete posts and journals when it feels like it. Everybody who posted someting at appox the same time you did, lost their post/journal/whatever. Just be happy you weren't deleted yourself... :/
I suggest saving a copy of the journal, so you can repost if it goes missing again.
*grabs big stick and goes bug hunting*
"Don't complain under the stars
about the lack of bright spots in you life."
Henrik Wergeland, Norwegian writer