Your RSUs, like your other income, are not being taxed twice. Your sell to cover was approximately 22% of the total value of RSUs vested. If you owe tax after completing your return, you did not withhold enough to cover your total tax liability. It's probably close to impossible to calculate withholding that will result in no tax due and no refund.
Make sure the sell to cover amount, $7,000, was included in your total withholding. If you included this amount in taxes withheld, then you made the correct entry.
@ConusedByTaxes
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