Get your taxes done using TurboTax

I am in the same boat as some people i have two qualifying children and only got 500 for 1 of them I file through turbo tax, how did i get less when i claim both on my 2019 taxes and received a refund for them both, not understanding how turbo tax and the IRS figure out to get some people all theirs and others didn’t and will we get what was left off since others  got their  full economic impact check?