what exactly was the charitable "cache" donation? there are many limitations on the amount that can be deducted even cash.
rather than me list all the various limitations I point you to IRS publication 526
https://www.irs.gov/pub/irs-pdf/p526.pdf
the rules on the limits start on page 14.
it is possible the IRS made a mistake but we have no way of knowing because we can't see the details of your contributions. if the IRS is correct then it is likely something was not entered correctly in Turbotax for one or more of your contributions.
if you conclude your return was correct - ie an IRS or Turbotax error ten you can contact
The Audit Defense service provided by TaxResources, Inc., also called TaxAudit.com. If you paid for Audit Defense and you received an IRS notice, call them at 877-829-9695, or report your IRS notice on their website at http://intuit.taxaudit.com/. Do not contact the IRS until you have spoken to TaxResources. They may contact the IRS on your behalf.
