Sadly this is a catch to watch out for. Card firms can give you a higher interest rate than the one used to advertise the card, as only 51% of people accepted need to get this advertised APR.
So just because a card says it has a 34.9% representative APR, it doesn't mean that's the interest rate you'll get. However, use these cards right and you shouldn't be paying interest, which would mean the rate you get shouldn't matter.