No, the Conduct Summary will always show the last 25 games. There might have been some events in matches not included in the Conduct Summary that contributed towards the penalty, and there might have been matches in the window that were not relevant to the penalty, especially if the scorecard includes activity that contributed to a previous low-priority penalty. The purpose of the report is to give you a general idea of how your behavior is affecting others, not to pinpoint the threshold where penalties kick in.