Why is the amount in 1040 block 4a $83,074 and the taxable amount block 4b $1,670,629?

The screen on the Income Summary looks OK.  But when I get to the "Done with Income" screen, the $1,670,6297 shows up.  Grand total my wife and I only grossed a little over $104,000.  No wages - only retirement benefits and Social Security.