Whether or not the box gets checked depends on how you answer the questions about your child and if they qualify. This isn't a glitch.
If you need to change something you would need to Amend Your Return for 2020 in order to claim the ctc if you did not get it in 2020. The rules for the CTC have changed for 2021, there is no income lower limit as there was before.
qualify for the Child Tax Credit
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