Overtime deduction calculation

My base pay is $19/hour.  My overtime pay is $28.50/hour, so my overtime premium is $9.50/hour.  I worked 63 hours of overtime, so my non-taxable overtime income is $598.50 (63 x 9.5) and this is the number reported in box 14 on my W2.  I have two other W2's from non-exempt work and my total wages from all three W2's is just over $36,000.  I have no other taxable income (i.e. interest, dividends, etc).  

How come Turbo Tax Deluxe is stating my overtime deduction is $200?  Should it not be the full $598.50?