@Guru: Also upvoted. This issue happened also to me. I like the fact, that the information is preserved, but the WebInterface seems buggy at least with Firefox. I once created a note with like 20 minutes of writing and it seems to sync (i was on a wired connection with my laptop) nicely. In fact he just synced the first sentence, rest was lost.
So I now copy my text into notepad, complete it there and paste it completely to evernote, whenever using the webclient.
I hope they'll fix these things...