Hi @amandadiaspais
When I set the WP_DEBUG constant, it showed me a lot of warning. This page should give you more idea about it: https://codex.wordpress.org/Debugging_in_WordPress. But if it’s working for you, then there’s nothing to worry about.
If you want to fix it, I suggest you create the custom field group on the backend and then generate the PHP code from “Custom Fields > Tools”. Then you can modify the field group and the fields key based on the old field group.
I hope this makes sense 🙂
