Thanks for your confirmation @DMum ,
I have tested it on the portal. My first try is by any chance did you press "hide label" in the form design. The screenshot below for reference

If everything is okay from your side. Then on the web page, you have pointed out please try method 2
Method 2:
using chrome inspect tools > Could you inspect that label and see whether you can see that label property. Also check anything is hidden in CSS element.
Method 3: Make sure your browser has no third-party extensions installed especially adblocker. Try in different browsers and let us know the result.
Method 4: Clear the cache by going to the following URL
Going to your portal service page: https://<your_portal>.powerappsportals.com/_services/about
Note: You should be the admin of the environment.
Hope it helps.
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