This apparently only involves Best Performances.
I am in a PL in recruiting status, PL 7181 (Chunky Fall Classic 2010) and, to my surprise, there is a list of Best Performances from previous games. However, those Best Performances are not from this PL, but from League IV.5 of Columbia, which happen to be number 7181, too.
(http://www.buzzerbeater.com/league/7181/overview.aspx)I personally think it's already a bug that we get Best Performances from owners from the past with our own team number, but apparently, private leagues get best performances from public leagues with same league number.
"Air is beautiful, yet you cannot see it. It's soft, yet you cannot touch it. Air is a little like my brain." - Jean-Claude Van Damme