The information for the custom fields is stored in the content items configuration files, located in App_Data -> Sitefinity -> Configurations. The configurations settings for the custom fields are stored in the lazy configs for each back-end section -Edit/insert/List/Preview/VersionPreview and are loaded by the main config for the module. Please, ensure the uploaded configurations are correct and the application pool of the application has Read/Write permissions for the App_Data folder.
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