How can I stop my Apple Watch Series 8 from misreporting exercise duration?

Sometime last week my apple watch started recording too many exercise minutes. Yesterday, I ended up with over 150 exercise minutes. I have checked my health data in the phone and the watch app. I have reset the calibrations and went for a 20 minute walk. I have restarted the devices and it still records too much exercise.

[Re-Titled by Moderator]