@CaraLagumen it appears to be something with the copy/paste that’s messing things up. When I copy/paste your code into the challenge editor, all the tests fail. When I delete and re-type your HTML codes (i.e. '<') in the editor to match what you have, the tests pass. I don’t think this is a bug with the challenge, but is something strange happening with the copy/paste instead.
This same thing recently happened to someone else: Convert HTML Entities - Chrome console shows right answers