That’s weird. Maybe the code is placed in the file of your theme or plugins. Could you please try to reproduce the issue on one of the WordPress’ stock themes (like Twenty Sixteen) with other plugins deactivated? If it disappears, then you can activate the theme and plugins one by one to see which one causes the issue.
If the issue disappeared when you changed the theme, then it means that the code is registered in your theme. I suggest you run a text search (field_breed) by using a search tool. There are several tools that can do it: http://stackoverflow.com/questions/317944/tools-to-search-for-strings-inside-files-without-indexing.
Welcome to the Advanced Custom Fields community forum.
Browse through ideas, snippets of code, questions and answers between fellow ACF users
Helping others is a great way to earn karma, gain badges and help ACF development!
The ACF site is currently experiencing some issues.— Advanced Custom Fields (@wp_acf) September 21, 2022
We apologize for the inconvenience and we are working hard to get it back up and running as soon as possible.
© 2022 Advanced Custom Fields.