I think that's been reported. Did you file Single or Joint? Were you a dependent? If you were a dependent your Standard Deduction could be less. The Standard Deduction for Single was $12,550. Or did you mean your line 12a is 25,100?
For 2021 the standard deduction amounts are:
Single 12,550 + 1,700 for 65 and over or blind (14,250)
HOH 18,800 + 1,700 for 65 and over or blind
Joint 25,100 + 1,350 for each 65 and over or blind
Married filing Separate 12,550 + 1,350 for 65 and over or blind
