If you filed before your parents did, and they claimed you as a dependent, they wouldn't be able to e-file their return.
You amended your return too soon, that is another issue. You might need to amend your return again to claim your payment as a refund.
If your parents received the 3rd stimulus payment ($1400) on your behalf already, you will not receive the $1491 claimed on your original return.
Work with your parents and ask them if they have filed, whether they claimed you on their return, etc.
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