You may have updated a special override and it doesn't seem to have updated.
All updates to the Peer-to-Peer giving section of the setup will take place on the 1st of the next month. Clicking the Match Rules button will update the current giving rules to match what you set up in the Peer-to-Peer Giving page of Setup. This is typically done if you make adjustments to Peer-to-Peer Giving and want those adjustments to take effect immediately. Otherwise, your changes will take place on the 1st of the month.