Hi there @pretendadult, good to see you around. Note that is not possible to reset your personal best of your challenges. I'm sorry you are experiencing this issue, however note this is a glitch in the mobile app and our team is working hard to fix this although I don't have a timeframe to share with you at the moment. But rest assure if I know something new, I will let you know.
In the meantime make sure your tracker is syncing correctly your information. You can find more information here: Syncing troubleshoot for iOS devices.
In addition to this, recently was released a new version of the app for iOS. If you haven't updated your app please Click here to be redirected to the iOS App Store. Once you have installed the new version, it might be require to restart your device. Usually this type of issues are resolved with new versions of the app so it important to keep the app to the latest version.
See you around and let me know if you have more questions.
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