Zillow credit score model

What’s up with Zillow? Completed an application and received a score of 639 based on some (clearly very inaccurate) Experian model. Pulled a report directly from Experian (had to sign up for trial membership) and it was 697, almost 60 points higher. Then did another application on Transunion smart move and the score was 747. That’s more than 100 points higher than Zillow’s score. All on the same day. Just sharing in case it might be helpful for someone.