Amt applicability and zero income tax liability

Hello,

I'm an individual senior citizen and my income is from salary, interest(FD) and shares. My taxable income comes to Rs. 404130 after all the deductions. There is no capital gain, but short term capital loss from shares. I'm filing my income tax return through ITR2 excel utility. 

In Part B tt1, tax payable on total income is being shown zero. Secondly, the AMT schedule is also showing income adjusted total income of Rs. 404130 under section 115jc. Why the tax liability is not being shown even though the schedules filled by me have been validated by excel utility?