The interpretation is actually

• 1st place has score 1
• 2nd place - there is no 2nd place, it's a tie for first, with score 1
• 3rd place has score 2
• 4th place - there is no 4th place, it's a tie for third, with score 2
• 5th place - there is no 5th place, it's a tie for third, with score 2
• 6th place has score 6