I noticed that happening when I bought it as well. I asked a sales lady where they were, and twice she referred to 'caps' even though I kept saying 'cups'.
Anyone else noticed that?
Incidentally, can anyone think of a very quick explanation I can give of menstrual cups to people like the gynecologist? It was a free GUM clinic, so I was trying to be fast and not take up too much time - they were packed.