Problem with clearing them all up is that they are all different versions of the note, so i have to find the one that is most recent - which can be difficult if i don't remember the changes I made. Can still be figured out, but would rather not have to deal with the issue.
As far as the connection speed, that is an interesting hypothesis. There are only 2 spots i access evernote on the web, and one of them does have a slow connection. I'll pay more attention next time when/if the duplication happens. However, i won't be in either of those two spots for a few weeks. :/