Which browser are you using and on which Operating System?

The problem is getting caused by the click-to-add function, and the way the browser is garbling the encoding of Chinese characters when it sends them to the server. This may be a problem related to the site upgrade, but I can't debug it until I can replicate the problem.

http://popupchinese.com/tools/vocabulary

With that said, I'll clear them out of your account. You can manage your vocabulary list directly at the link above as well. Please let me know your browser and operating system though, as I would like to get this fixed if it is within our capacity.