No, your are not double-taxed for selling RSU stock.
The Federal tax withheld is added to your W-2, so you are getting credit for it when you report your W-2.
The 1099-B reports the gain/loss on the FMV on the vesting date to the FMV on the sale date.
If you don't enter the correct Cost Basis for your 1099-B, you'll end up paying more or less Capital Gains Tax on the proceeds than you should.
This may or may not affect your total refund, depending on your other income.
Click this link for more info on How Capital Gains are Taxed.
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