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This looks like there is an issue with JSON.
Do you have a acf-json folder in the theme?
These types of issues can happen if for some reason ACF is unable to update the JSON file, or delete it.
Fields not appearing where they should – ACF fails to write the changes to the JSON file. When editing the page the old JSON file is still being used. You see them in the field group because editing the field group does not load json files
Delete field groups appearing – ACF was unable to delete the json file when you trashed the group. The group may be listed under sync available.
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