Following a report of the issue by a user, I attempted to add multiple consecutive references. I began with bare URLs and started with 6. You can see that VE thinks it is going okay (http://en.wikipedia.org/wiki/File:VEmultiref.png), but when you save it only saves one (http://en.wikipedia.org/w/index.php?title=User%3AMdennis_%28WMF%29%2Fsandbox&diff=566304458&oldid=566304152)
I tested it all the way down to two.
In case it was an issue with bare refs, I tried it using citation templates, and it would also not save two in a row. It still only saved one:
I'm using Chrome, Windows 7.