Storage isn't working?

When this set of code runs for some reason either green_starter_owned is false or “green starter” is not being added to “Cars”
I am using an extension for arrays
Why? and saving everything to “Cars” as text
How do I fix this?
Screenshot 2025-04-17 4.07.26 PM
more images in messages below

Screenshot 2025-04-17 4.06.48 PM

Screenshot 2025-04-17 4.07.17 PM

Please can someone help?