You cannot electronically submit a state return without filing the federal return. So if you have the state return boxes checked, the federal would also have to be sent in order to transmit the states.
Filing an extension does not stop your federal return from being filed.
When did you file the extension? If this resulted in a duplicate payment, you will need to contact the IRS to stop the payment on one of them.
If your return was accepted, you will need to wait until it is processed in order to Amend Your Return
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