Evernoteās Export to HTML function appears broken. 
Note: The question of what is the rightful URL of an imported Evernote document is undecided. Some people want to link back to their Evernote notebooks. Others want to get the external URL specificed in the Evernote note. The current design favors the former. However, there is a script that will convert the URL of selected Evernote documents in DEVONthink. Check this out: Evernote Import URL Capture