i have created my own vocabulary list containing about 50 words. However, when I'm studying the "flashcards" just keep repeating the same 7 or so. I've been through these 7 words at least 10 times but no new words are being added. I have had 98.6% accuracy, so I don't think it's detecting that I need more practice, but I can't figure out why it won't add more words.