We have the same personal fundraising event, and a user registered 2 times and the newer personal page is unable to be accessed. What needs to change to edit the newer version?
The older personal fundraising pages will need to be deactivated to allow for the newer version to be used. The url to populate the personal fundraising page uses url parameters that include an fr_id and a constituent id which would be the same for multiple pages. Once you deactivate the older one and give the system some time to update it should allow the user to login and make changes to the newer registration.