Child tax credit question

. Does anyone know why this happened? I have a few W4s that I never filed . So I started to put the information into my turbo tax account . So I’ve noticed that I’m only getting $800 child tax credit for my 2 kids that’s under 6 . I thought the child tax credit was $3k each . Is anyone able to help me understand why I’m only getting $800 . I get the child tax credit every year and my income in actually way less this year then any other year so I’m not sure why it’s like this