Hello storybookcorner -
Please note that Custom Item Specifics information is category specific and is not required and may not be available for all categories. If you are encountering this issue in a category where the Custom Item Specifics information is required, please let us know the specific category and any other details in a support case so we can take a look. You can file a support case at any time from under the Help tab of the site.
Please also note that you may have also received an API warning from eBay indicating a category change, and we would need to look into the specific item to assist you in resolving that.