1. Contact Intuit - contact support.
2. Take a look at Publication 526, Charitable Contributions. It opens to the first page listing Limits of Deductions, press the underlined 15. There are many limitations depending on many options. All of them are based on AGI.
3. If you are on a MAC with the download version, you can switch to Forms mode. When you override values there, you will void the accuracy guarantee but will have the program doing the math and carrying things through.
4. If there is a problem, contact support to escalate the issue.
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