That's very much more complex than can be handled with simple troubleshooting in comments here!

For the duplicates, run the imported content removal and then try importing again. (You should wait until the LJ troubles ease up, yes.) For the entry missing, you should open a support request. Please do be aware that import problems are very complex and can only be handled by certain people, all of whom are very busy, and so it might take a long time before someone can help you troubleshoot.