Sam, this sounds like bullet point 7 or 8 were not completed from our guide at https://www.8020endurance.com/80-20-garmin-apps/ See below, 7 and 8 in bold. The app will use default zones until you tell it what your actual zones are.
Step 1: Install the 80/20 Zones app on your Garmin device.
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Be sure you have a Gamin Connect account
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Install the Garmin Connect smartphone app on your phone
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Add your Garmin device to the Garmin Connect app and ensure it can successfully sync
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Load this web page on your smartphone and then click here for the Run app or here for the Bike app
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Once on the app page, choose Download, accept any permissions, and confirm your device
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Sync your Garmin device
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Once sync’d, within the Garmin Connect app go to More-> Garmin Devices-> Choose the device you just sync’d-> Activities, Apps, & More-> Data Fields-> 80/20 Run (or Bike) Zones-> Settings
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Select your preferred intensity type: Power, Pace, or Heart Rate and enter in your thresholds as identified in the documents Intensity Guidelines for Running or Intensity Guidelines for Triathlon
I had noticed this issue too, where my zones would display correctly for about an hour, and then would become wildly inaccurate for the rest of the ride. I saw the app had an update a couple days ago and it appears to be displaying correctly now, but I’ve only tested it with two 1-hour rides since then.
Sam and I connected by e-mail and fixed her specific issue, which was just an error in the threshold value and entry. But yes, there is a new version of the app that I understand has improvements.