Yup, that’s a bad pot for sure. Happens about once in 2,000. I’ll send you a new one. Shot an email to info-at-zeppelindesignlabs=dot=com. Include your serial number if you’ve got it, and shipping address.
Meanwhile you can confirm the pot is bad (and check out the other wave forms) by gently pressing down on the pot stem while turning. That should put the wiper in contact with the little carbon strip inside.