I really have no clue but found this on ebay.
I don't know what you listed..but this might give you a clue as to what specifics to look for. Condition, sizes, color, etc.
Go back and check your listings for any of the things mentioned below & see if that helps. Sorry I couldn't be more helpful. Have never seen that.
How sellers add item specifics
Item specifics let you provide details about the item you’re selling, such as its condition, size, color, or style. These details appear at the top of your listing description, in a consistent format, making it easy for buyers to get the facts about your item.
When you create your listing, review and complete the Item specifics section for the item you’re selling. In this section, you’ll provide important details about your item’s features and condition.
To include item specifics in your listing:
In the Item specifics section of the Sell Your Item form, enter the suggested details for your item.
For example, specify whether your item is new or used by selecting among the choices on the Condition drop-down menu.
If any item specifics are prefilled for you, verify that they’re correct. If not, revise them.
Add other item specifics that apply to your item by clicking the “+” sign next to the item specific.
Tip: To add your own custom detail, click the “+” sign next to “Add your own item specific.” For example, you might create an item specific called “Material” and specify that your item is “plastic.”
Remove any details that don’t apply to your item by clicking the “Remove” link next to the item specific.