Yeah, I had this exact same problem for the 1965-66 season.
Standings during the season were:
1. Chicago
2. Toronto
3. New York
4. Detroit
Playoffs should've been:
1. Chicago vs 3. New York
2. Toronto vs 4. Detroit
but instead were:
1. Chicago vs 2. Toronto
3. New York vs 4. Detroit
Thanks for getting it fixed