Fleaflicker power rank is different to playoff ranking. It may be the case that the top 3 teams from each division make the playoffs.
If you look on the playoffs tab, it gives you a breakdown of each time a tiebreaker was used. It looks like all divisional tiebreakers were sorted first (putting Siemian above you, and Ayr Honeybadgers above the others in that division). Then another tiebreaker based on head to head between those two teams.