Because the Pacers and Sixers ended in a tie - here is how a tie is broken. The part in bold is what applies in this situation - because the 12th team gets 7 combinations (.7% chance of getting the top pick) and the 11th team gets 8 combinations (.8% of getting top pick).
In the event of a tie, each tied team receives the average of the total number of combinations for the positions involved. In 2006, the Minnesota Timberwolves and Boston Celtics tied for sixth, resulting in each team getting 53 combinations (the average of 63 and 43). Should the average number not be an integer, a coin flip is then used to determine which team or teams receive the extra combination(s).