After you file

Hi! When doing my taxes on Saturday, when I was asked did I receive the stimulus, I clicked no, because I thought this was only for the $600 that some didn't receive in December, and a window came up and said something like "I have that information.  It calculated something and at the end of my filing, my Recovery Rebate Credit was $3600!!!  It's only me, my husband and our 17 year old daughter.  I think it calculated the $1200 that we DID receive in 2020.  I am so confused.  I dont' want to get in trouble with the IRS. YIKES