Is it normal for Invisalign buttons to feel jagged and to really hurt the inside of the mouth? Does it get better?

When I went for my consult, I was shown a model of a mouth with a set of Invisalign trays containing tiny, circular buttons, which I thought were no big deal. The buttons I received are considerably bigger, are jagged, and very sharp. They clip my mouth when I eat causing large canker sores to form. I also have sores from the edges of the trays in my mouth and tongue. I have to talk a lot for work, which exacerbates the pain. Is this normal? Is my dentist incompetent? What can I do?