Just ran into this issue, and it is a VERY short sided coding issue, should be easily fixed. You don't have to have made 10,000,000 on a w-2 to run into it. Anyone who dabbled in day trading can get there really quick because if you buy/sell/buy/sell/buy/sell your cost and proceeds stack up. You could easily have something like 20,000,000 cost 20,010,000 proceeds. In that case (similar to mine) you didnt MAKE 10m, never HAD 10m, but the frequency of trading caused large reported numbers. Honestly, anyone who has coded a single project can see that this should be an easy fix (and should never have been an issue).
