How come one person entered got a ticket with the numbers 1 2 3 4 5? Sounds dodgy to me. And also lost my one zeta there.
When you select number of tickets, system by default displays 1,2,3,4,5 for each ticket.
Then you can change numbers manually by changing each number or use PICK button - system will randomly pick numbers for you.
In the case you describe someone did not use any of these and just ordered 1,2,3,4,5.
You can always hit Buy button and see how it works, then close if you do not want to order.