Not sure I'd want to submit a bunch of negative numbers to the IRS as part of a tax return.  Looks like Lacerte is using a 32-bit register and your stack overflowed and wrapped back around to negative numbers.

2^32 = 4294967296

From your screen cap:

4038716428 (correct amt) + 256,250,868 (negative reported amt) = 4294967296

Mmmm, math.  I would assume there's as much negative space as positive space so your upper limit would probably be 2147483648 - 1 = 2,147,483,647.  So total gross proceeds over that amount and Lacerte will choke too.

Rick