Why is my chritable contributed limited on schedule A line14 ?

[quedebo-]

My charitable contribution of appreciated stock to Schab Caritable was limited to 62% of its value even though it was less than 50% of adjusted gross income. Any reason?

[HelenaC]

Per IRS Publication 526, page 11: The amount you can deduct for a contribution of ordinary income property is its fair market value minus the amount that would be ordinary income or short-term capital gain if you sold the property for its fair market value. Generally, this rule limits the deduction to your basis in the property. 

Example. You donate stock you held for 5 months to your church. The fair market value of the stock on the day you donate it is $1,000, but you paid only $800 (your basis). Because the $200 of appreciation would be short-term capital gain if you sold the stock, your deduction is limited to $800 (fair market value minus the appreciation).