Confusion about Championships placement

Can anyone explain to me why 254 competed in St. Louis in 2017 but Houston in 2018? Is it because they are a Hall of Fame team?

HoF teams were allowed the choice of world Championships -fixed.
Here is the FRC Blog on the details for 2017:

1 Like

I believe that was extended to all prequalified teams, as long at the totals at each championship roughly balanced after the switching.

This is not accurate. 341 and 175 went to Houston in 2018, and 987 and 16 are attending Detroit 2019.

Hall of Fame teams are allowed to switch Championships, provided the HoF teams can ensure that the ratio of HoF teams between the two Championships doesn’t exceed ~2:1