Received a stimulus check as a non-resident alien

I checked my bank account and found that I received $1400 from the IRS. It looks like it is a stimulus check from 2021 based on this: https://www.cbsnews.com/news/irs-special-payment-1400-1-million-people-who-qualifies-stimulus-check/ Though this doesn't make sense for me because I first arrived in the US in 2021 and I filed form 1040-NR and 8843, which basically means I filed my tax as a non-resident alien. Would this be a mistake? And if so, how should I proceed with this?

Thank you in advance!