You are in multi-user mode and you added a note when you create or edit a non-inventory item such as:
When you edit the item, the note is missing.
For items that are NOT inventory, you can switch to single-user mode and add the item note.
For Inventory items, you should be able to add notes even when you're in multi-user mode and access them through the Inventory Center.
At Intuit, we strive to provide the highest quality product by assigning resources to address the issues with the biggest customer impact. In some cases such as this one, a fix will not be immediately available but may still be included in a future release.
Any future updates on this issue will be included in this help article.