click on the rules link at the top of your league page... it explains ties there.
Here's the relevant snippet:
For each conference, the division winners will be determined based on overall record, head to head record, division record, conference record, and then total point differential (your points - opponent points). When determining division winners, head to head record is your record against any teams with the same overall record as you within your division.
The top 6 teams will be seeded based on division winner, overall record, head to head record, conference record and then total point differential (your points - opponent points). When determining division winners, head to head record is your record against any teams with the same overall record as you within your conference.