Get your taxes done using TurboTax

I am also in this category. I got so far along in the TT program and it said I owe $1,800. Then it wanted me to fill out a Est. Tax Penalty form 2210. Then it asked me about the stimulus checks and the amount I owe jumps to $3,100 +/- ? I thought I read where these stimulus checks do not affect one's taxes? Then why did it jump up?