I'm not exactly sure what you are saying. I don't use ID any more, partly for the reasons I will mention. But when I was using it, it was always the case that the values imported to the tax return were different (and usually lower) than the values shown during the year. If you look at the fine print, the values shown during the year are "estimates", and the final values are determined when you import the data into Turbotax. Supposedly there is a person or persons whose job it is to monitor thrift stores and internet sales to come up with reasonable average prices, and update the results as needed. The updates are only applied at tax time, to the imported figures, and are not applied continuously throughout the year to the "estimates".
This is just how they decided it will work. If you don't like it, use your own values.
In fact, there was at least one taxpayer who reported on this forum several years ago that their donations were audited, and the ItsDeductible values were denied by the IRS because the taxpayer couldn't show that the values were applicable to the particular items donated, in the condition donated, and taking into account regional geographic and economic variations. In other words, if the ID system values a used purse at $10, is that what someone would pay on eBay, or a thrift store in Manhattan, or a garage sale in Springfield MO? What level of wear and tear? What was the original cost?
In short, there is no guarantee that ID values will be accepted by an auditor, because they are not particular to the time, place, and value of the item.
For my donations, I keep a handwritten inventory, and I make specific notes about value, based on the prices charged by the Goodwill store where I make most of my donations. For some items (furniture, electronic equipment) I get values for comparable items from eBay (completed sales, not listings) or Facebook Marketplace. Sometimes I print out those records and staple them to my handwritten notes. Then, I group all the donations on one day together and enter the total value, rather than listing every specific item (e.g. 5/4/2025--Goodwill--clothing and household items--$XX). If needed, I have the written inventory to show the details to the IRS.
If you use ItsDeductible as a convenience, be aware of the limitations, and one of the limitations is that the "final" values are always different, and usually lower, than the "estimates" you get during the year.
