You are correct if the stock was held for more than 1 year (various) then the FMV will be used. If the stock was held for less than 1 year then the lower of cost or FMV will be used.
Delete the donation and complete the topic interview to be sure it cleared. Then go back to enter the donation again. Enter FMV at time of donation in its box and then actual cost in the cost box. If it still insist on taking cost for the long term holding then enter the FMV in the cost box and the FMV box.
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