Why is the Tax-Exempt Interest on my 1040 not the same as what I entered?

My Form 1099 shows: 8 Tax-Exempt Interest.........................26,831.94 The Form 1099-INT Worksheet in TT shows the same amount (Box 8). This amount is carried correctly to Schedule B in TT. But on Form 1040 in TT, the amount shown on Line 2a is $12,416. I am perplexed! Help!