There seems to be a bug on Form 6251 - Line 19. The amount is always $1,581 regardless of changing my 7 sources of income by +/1 $1,000. My total income is $275,000.

There seems to be a bug on Form 6251 - Line 19.  The amount is always $1,581 regardless of my income.  On Form 1040 worksheets, I've experimented by changing each of my 7 sources of income by -$1,000.  One at a time.  Line 19 always remains $1,581. My 7 sources of income on Form 1040 are: Taxable interest, line 8a. Tax-exempt interest, line 8b. Ordinary dividends, line 9a. Capital gain, line 13. IRA distributions, line 15b. Rental, line 17. Social security benefits, line 20b.  Total income, line 22 is approximately $275,000.