I successfully imported all the LJ entries to wordpress few years back. I did not notice the comments made on those entries until recently and figured out they were jumbled. Comments of some other posts were appearing in some irrelevant posts. There is no way I can think of to fix them as there are lots of entries, and I see no point now in reporting the error to wordpress. Sad! Only thing I gained after import is that my entries are private now, and feels good to read something which I jotted 6-7 years back!