Is this a Bug report ?
The 'Undo Finish race' option sets the 9's marker in the Live Export data file. The entries that follow this marker record will be those (late or adjusted) time records, ie NOT chip start/gun times for the whole race.
For as many races that get 'undone', a 9's marker record gets written to file.
Feature request following my previous entry above in this conversation : I guess 99999 is a legitimate Bib No ? If so, then I might suggest the dd/mm/yyyy value is set to 01/01/0001, for example, so as to suggest a special marker rather than a potential runner's time.