Annualized Self-Employment Earnings

A prompt popped up as I was finishing my 2019 tax return:
"Underpayment Penalties". I owe $81 due to the penalty (my income greatly fluctuates, I am self-employed). 

What I don't understand is when I go to enter my "Annualized Self-Employment Earnings", the 01/01/2019 - 12/31/2019 period is auto filled, but it is NOT the correct amount. The amount auto filled is about $2,000 under my actual income for 2019; my net income does not match it.  Is this a bug or what have I missed here?