Here you go Bill,
This is an old bug, corrected in the RDSS2 update-in-progress (subsequent PPs for a given horse can sometimes remove it from earlier assembled PPs). Meanwhile, you CAN correct it yourself by using the old RDSS1 (if you still have it) and use the 'Import old PPs' routine to import that June 10 PRX card, then re-assemble that race in RDSS2 (Google it for the documentation post).
Ted