Look at it like this Pam.

Stay for 6 nights and only pay for 5 nights. (our safari program)
Stay for 7 OR 8 nights and only pay for 6 nights.

So when you move into the 7th night you have to pay for ONE MORE NIGHT as in the safari you have only paid for five nights.

You cant get 2 free nights when only paying for 5 nights and that is all you will have paid for in the safari. So by staying FOUR nights at Leopard Hills you move into a Seven night stay hence a one night additional charge.

You have a choice to say the eighth night if you chose.

It gets confusing I wish they worded it better.